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Case Study Questions for Class 8 Science Chapter 9 Reproduction in Animals

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Here we are providing case study questions for CBSE Class 8 Science Chapter 9 Reproduction in Animals.

Case Study Questions

Question 1:

Read the passage carefully and answer the questions that follow-

For the continuity of life, all living things produce organisms of their own kind. This is called reproduction. A special organ system called the reproductive system is responsible for carrying out the process of reproduction in a living body. Although all living things reproduce they do so by different means. There are two types of Reproduction-Asexual and Sexual reproduction. Asexual reproduction requires one parent while Sexual reproduction requires two parents to produce a baby. Asexual reproduction is the simplest form of reproduction and is commonly found in plants and lower animals like starfish, sponges and worms. Most plants and mammals, including human beings, reproduce sexually.

a) What is reproduction? i) Producing fruits ii) Producing young ones of its own kind iii) Producing food iv) All of these

b) What are the two types of reproduction? i) Budding ii) Fragmentation iii) Asexual reproduction iv) Sexual reproduction a. i) b. ii) c. ii&iv d. iii &iv

c) Which type of reproduction involves only one parent? i) Sexual reproduction ii) Asexual reproduction iii) Both of these iv) None of these

d) How do mammals reproduce? i) By sexual reproduction ii) By asexual reproduction iii) By budding iv) All of these

e)Identify the organism which reproduces asexually. i) Shark ii) Sponges iii) Snake iv) Snail

b) iii & iv (Option c)

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Case Study Questions Class 8 Science Reproduction in Animals

Case study questions class 8 science chapter 8 reproduction in animals.

CBSE Class 8 Case Study Questions Science Reproduction in Animals. Important Case Study Questions for Class 8 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Reproduction in Animals.

At Case Study Questions there will given a Paragraph. In where some Important Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks, 4 marks.

CBSE Case Study Questions Class 8 Science Reproduction in Animals

Case study 1.

Do you recall the processes ofdigestion, circulation andrespiration which you havestudied in your previous classes? Theseprocesses are essential for the survivalof every individual. You have also learntabout the process of reproduction inplants. Reproduction is essential for thecontinuation of a species. Imagine whatwould have happened if organisms hadnot reproduced. You will realise thatreproduction is very important as itensures the continuation of similarkinds of individuals, generation aftergeneration.Modes of Reproduction:Have you seen the young onesof different animals? Try to name someof the young ones by completing shown in examples at S. No.1 and 5.You must have seen the youngones of various animals being born.Can you tell how chicks andcaterpillars are born? How are kittensand puppies born? Do you think thatthese young ones looked the samebefore they were born as they do now?Let us find out.Just as in plants, there are two modesby which animals reproduce. These are:(i) Sexual reproduction, and(ii) Asexual reproduction.Sexual ReproductionTry to recall reproduction in plantswhich you studied in Class VII. You willremember that plants that reproducesexually have male and femalereproductive parts. Can you name theseparts? In animals also, males andfemales have different reproductive partsor organs. Like plants, the reproductiveparts in animals also produce gametesthat fuse to form a zygote. It is the zygotewhich develops into a new individual.This type of reproduction beginningfrom the fusion of male and femalegametes is called sexual reproduction.Let us find out the reproductive partsin humans and study the process ofreproduction in them.

Que. 1) Reproduction is essential for the continuation of a ……………………………………………………………………………………………….. .

(b) Species

Que. 2) Which among the following is the correct option stating the young one of butterfly?

(a) Caterpillar

Que. 3) Calf is the young one of which of the following animals given below?

Que. 4) Explain in detail term “sexual reproduction” in animals.

Que. 5) Name the two modes of reproduction in animals.

Que. 1) (b) Species

Que. 2) (a) Caterpillar

Que. 3) (d) Cow

Que. 4) Answer:In sexual reproduction, the reproductive parts produce gametes that fuse to form a zygote. The zygote develops into a new individual.

Que. 5) Answer: The two modes of reproduction in animals include: i) Sexual reproduction ii) Asexual reproduction

Case study 2

Male Reproductive Organs: The male reproductive organs include apair of testes (singular, testis), two spermducts and a penis. The testesproduce the male gametes calledsperms. Millions of sperms are producedby the testes. Thoughsperms are very small in size, each hasa head, a middle piece and a tail. Doesit appear to be a single cell? Indeed, eachsperm is a single cell with all the usualcell components.Female Reproductive Organs:The female reproductive organs are a pairof ovaries, oviducts (fallopian tubes) andthe uterus. The ovary producesfemale gametes called ova (eggs). In human beings, a singlematured egg is released into the oviductby one of the ovaries every month.Uterus is the part where development ofthe baby takes place. Like the sperm,an egg is also a single cell.Fertilisation: The first step in the process ofreproduction is the fusion of a spermand an ovum. When sperms come incontact with an egg, one of the spermsmay fuse with the egg. Such fusion ofthe egg and the sperm is calledfertilisation. Duringfertilisation, the nuclei of the sperm andthe egg fuse to form a single nucleus.This results in the formation of afertilised egg or zygote. Didyou know that the zygote is thebeginning of a new individual?The process of fertilisation is themeeting of an egg cell from the motherand a sperm cell from the father. So,the new individual inherits somecharacteristics from the mother andsome from the father. Look at yourbrother or sister. See if you can recognisesome characters in them similar to thoseof your mother or your father.Fertilisation which takes place insidethe female body is called internalfertilisation. Internal fertilisationoccurs in many animals includinghumans, cows, dogs and hens.Boojho and Paheli’s teacher once toldthem in the class that in some womenoviducts are blocked. These womenare unable to bear babies becausesperms cannot reach the egg forfertilisation. In such cases, doctorscollect freshly released egg andsperms and keep them together for afew hours for IVF or in vitrofertilisation (fertilisation outside thebody). In case fertilisation occurs,the zygote is allowed to develop forabout a week and then it is placed inthe mother’s uterus. Completedevelopment takes place in the uterusand the baby is born like any otherbaby. Babies born through thistechnique are called test-tubebabies. This term is actuallymisleading because babies cannotgrow in test tubes.You will be surprised to know thatin many animals’ fertilisation takesplace outside the body of the female.In these animals, fertilisation takesplace in water. Let us find out howthis happens.During spring or rainy season, frogsand toads move to ponds and slow-flowing streams. When the male andfemale come together in water, thefemale lays hundreds of eggs. Unlikehen’s egg, frog’s egg is not covered by ashell and it is comparatively verydelicate. A layer of jelly holds the eggstogether and provides protection to theeggs.As the eggs are laid, the maledeposits sperms over them. Eachsperm swims randomly in water withthe help of its long tail. The spermscome in contact with the eggs. Thisresults in fertilisation. This type offertilisation in which the fusion of amale and a female gamete takes placeoutside the body of the female is calledexternal fertilisation. It is verycommon in aquatic animals such asfish, starfish, etc.

Que. 1) Which of the following is NOT a part of the female reproductive system?

(a) Fallopian tube

(b) Ovaries

Que. 2) The type of fertilisation in which the fusion of male and female gametes takes place outside the body is called ……………………………………………………………………………………….. .

(a) Internal fertilisation

(b) External fertilisation

(d) Directional fertilisation

Que. 3) Which among the following is the correct full form of IVF?

(a) in voluntary fertilisation

(b) inter vesicular fistula

(d) in vitro fertilisation

Que. 4) Define the process of fertilisation in detail.

Que. 5) What are test tube babies?

Que. 1) (c) Testes

Que. 2) (b) External fertilisation

Que. 3) (d) in vitro fertilisation

Que. 4) Answer: When sperms come in contact with the egg, one of the sperm fuses with egg to form a zygote, the process is called fertilisation. The nuclei of sperm from male and the nuclei of ovum from female fuse to form a single fertilised egg or zygote.

Que. 5) Answer:The eggs and sperms are taken out from the human body and are kept together for few hours for in vitro fertilisation. In case fertilisation occurs, the zygote is allowed to develop for a week and then placed in the mother’s uterus. And the baby thus formed is called a test tube baby.

Case study 3

How could a single cellbecome such a bigindividual?Development of Embryo:Fertilisation results in the formation ofzygote which begins to develop into anembryo. The zygote dividesrepeatedly to give rise to a ball of cells. The cells then begin to formgroups that develop into different tissuesand organs of the body. This developingstructure is termed an embryo. Theembryo gets embedded in the wall of theuterus for further development.The embryo continues to develop inthe uterus. It gradually develops bodyparts such as hands, legs, head, eyes,ears etc. The stage of the embryo inwhich all the body parts can beidentified is called a foetus.When the development of the foetus iscomplete, the mother gives birth tothe baby.Internal fertilisation takes place inhens also. But, do hens give birth tobabies like human beings and cows? Youknow that they do not. Then, how arechicks born? Let us find out.Soon after fertilisation, the zygotedivides repeatedly and travels down theoviduct. As it travels down, manyprotective layers are formed around it.The hard shell that you see in a hen’segg is one such protective layer.After the hard shell is formed aroundthe developing embryo, the hen finallylays the egg. The embryo takes about 3weeks to develop into a chick. You musthave seen the hen sitting on the eggs toprovide sufficient warmth. Did you knowthat development of the chick takesplace inside the egg shell during thisperiod? After the chick is completelydeveloped it bursts open the egg shell.In animals which undergo externalfertilisation, development of the embryotakes place outside the female body. Theembryos continue to grow within theiregg coverings. After the embryos develop,the eggs hatch. You must have seennumerous tadpoles swimming in pondsand streams.Viviparous and Oviparous Animals: We have learnt that some animals givebirth to young ones while some animalslay eggs which later develop into youngones. The animals which give birth toyoung ones are called viviparousanimals. Those animals which lay eggsare called oviparous animals. Thefollowing activity will help youunderstand better and differentiatebetween viviparous and oviparousanimals.The eggs of a few animals are easyto observe because their mothers laythem outside their bodies. These areexamples of oviparous animals. But youwould not be able to collect the eggs ofa dog, cow or cat. This is because theydo not lay eggs. The mother gives birthto the young ones. These are examplesof viviparous animals.Young Ones to Adults: The new individuals which are born orhatched from the eggs continue to growtill they become adults. In someanimals, the young ones may look verydifferent from the adults. Recall the lifecycle of the silkworm (egg → larva orcaterpillar → pupa → adult) you studiedin Class VII. Frog is another suchexample.Observe the different stages of frogstarting from the egg to the adult stage.We find that there are three distinctstages, that is, egg → tadpole (larva) →adult. Don’t the tadpoles look sodifferent from the adults? Can youimagine that these tadpoles would someday become frogs? Similarly, thecaterpillar or the pupa of silkworm looksvery different from the adult moth. Thefeatures that are present in the adult arenot found in these young ones. Then whathappens to the tadpoles or caterpillarsthereafter?You must have seen a beautiful mothemerging out of the cocoon. In the case oftadpoles, they transform into adultscapable of jumping and swimming. Thetransformation of the larva into an adultthrough drastic changes is calledmetamorphosis. What about the changesthat we observe in our body as we grow?Do you think we too undergometamorphosis? In human beings, bodyparts similar to those present in the adultsare present from the time of birth.

Que. 1) The developing zygote called the embryo gets embedded in which part of the female reproductive system?

(a) Oviduct

(b) Wall of uterus

Que. 2) Complete the missing stage in the life cycle of silkworm: egg→ larva or caterpillar→ …………………………………………………………………………. →Adult

Que. 3) Which among the following is NOT an example of viviparous animals?

Que. 4) Define the term “metamorphosis”.

Que. 5) What do you mean by oviparous animals? Give one example.

Que. 1) (b) Wall of uterus

Que. 2) (a) Pupa

Que. 3) (d) Frog

Que. 4) Answer: The transformation of larvae into an adult through drastic changes is called the process of metamorphosis.

Que. 5) Answer: The animals which lay eggs and the egg later develops into an adult id called oviparous animals. Example of oviparous animals include chicks and most of the birds.

Case study 4

Asexual Reproduction: So far, we have learnt about reproductionin some familiar animals. But whatabout very small animals like hydra andmicroscopic organisms like amoeba? Doyou know how they reproduce? Let usfind out.In each hydra, there may be one ormore bulges. These bulges are thedeveloping new individuals and they arecalled buds. Recall the presence of budsin yeast. In hydra too the new individualsdevelop as outgrowths from a singleparent. This type of reproduction inwhich only a single parent is involved iscalled asexual reproduction. Since newindividuals develop from the buds inhydra, this type of asexual reproductionis called budding.Anothermethodofasexualreproduction is observed in themicroscopic organism, amoeba. Let ussee how this happens.You have already learnt about thestructure of amoeba. You will recall thatamoeba is a single-celled organism. It begins the process ofreproduction by the division of itsnucleus into two nuclei.This is followed by division of its bodyinto two, each part receiving a nucleus. Finally, two amoebae areproduced from one parent amoeba. This type of asexualreproduction in which an animalreproduces by dividing into twoindividuals is called binary fission.Apart from budding and binary fission,there are other methods by which asingle parent reproduces young ones.You will study about these in yourhigher classes.Story of Dolly, the Clone: Cloning is the production of an exact copy of a cell, any other living part, or acomplete organism. Cloning of an animal was successfully performed for the firsttime by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh,Scotland. They successfully cloned a sheep named Dolly. Dolly wasborn on 5th July 1996 and was the first mammal to be cloned.During the process of cloning Dolly, a cell was collected from the mammary glandof a female Finn Dorsett sheep. Simultaneously, an egg was obtainedfrom a Scottish blackface ewe. The nucleus was removed from theegg. Then, the nucleus of the mammary gland cell from the Finn Dorsett sheepwas inserted into the egg of the Scottish blackface ewe whose nucleus had beenremoved. The egg thus produced was implanted into the Scottish blackface ewe.Development of this egg followed normally and finally Dolly was born. ThoughDolly was given birth by the Scottish blackface ewe, it was found to be absolutelyidentical to the Finn Dorsett sheep from which the nucleus was taken. Since thenucleus from the egg of the Scottish blackface ewe was removed, Dolly did notshow any character of the Scottish blackface ewe. Dolly was a healthy clone ofthe Finn Dorsett sheep and produced several offspring of her own through normalsexual means. Unfortunately, Dolly died on 14th February 2003 due to a certainlung disease.Since Dolly, several attempts have been made to produce cloned mammals.However, many die before birth or die soon after birth. The cloned animals aremany-a-times found to be born with severe abnormalities.

Que. 1) The process in which the bulges in the body of Hydra called the buds develop into a new individual is called …………………………………………………………………………………………… .

(a) Binary fission

(d) Budging

Que. 2) Dolly was a healthy clone of which of the following sheep?

(a) Finn Dorsett sheep

(b) Scottish blackface ewe

(d) Cheviot

Que. 3) In which of the following year did Ian Wilmut successfully cloned a Sheep named Dolly?

Que. 4) Define the process of “asexual reproduction”.

Que. 5) What is the process of cloning?

Que. 1) (c) Budding

Que. 2) (a) Finn Dorsett sheep

Que. 3) (a) 1996

Que. 4) Answer: The type of reproduction in which only a single parent is involved is known as asexual reproduction. Budding is one of the examples of asexual reproduction.

Que. 5) Answer: Cloning is the production of the exact copy of the cell, any other living part or a complete organism. The first successfully cloned animal is a sheep named Dolly.

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Reproduction in Animals Class 8 Case Study Questions Science Chapter 6

Last Updated on April 21, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 8 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 8 science. In this article, you will find case study questions for cbse class 8 science chapter 6 Reproduction in Animals.

Table of Contents

Case Study Questions on Reproduction in Animals

Question 1:

Read the given passage below and answer the question:

All plants and animals go through life cycles. Just think about all the growing and changing human children do as they grow up. Children grow in height and get heavier until they reach adulthood. Children also change as their body matures. Although we grow lots from the time we are born to adulthood, humans never transform. Unlike us, butterflies go through a metamorphosis, or transformation. A butterfly looks very different as it changes through all four stages of its life cycle. A butterfly transforms through the first stage egg to the last stage adult butterfly. Similarly, frogs go through the same transformation from egg to an adult.

Q. 1. Frog and butterfly comes under: (a) Oviparous animals (b) Viviparous animals (c) Ovoviviparous (d) None of the above

Difficulty Level: Easy

Ans. Option (a) is correct. Explanation: Animals lay eggs which later develop into young ones. They are called oviparous animals. So, it is easier to observe the eggs of oviparous animals as they are outside the body.

Q. 2. What is another name of the pupa stage of butterfly? (a) Caterpillar (b) Adult (c) Chrysalis (d) None of the above.

Ans. Option(c) is correct. Explanation: The transformation of a caterpillar (larva) to a butterfly takes place in the chrysalis (pupa). Butterflies go through a life cycle of 4 stages: egg, larva, pupa and an adult.

Q.3. Define the term metamorphosis.

Difficulty Level: Medium

Ans. The process of transformation of a larva to an adult through a series of drastic changes, for example, frog, silkworm, butterfly, etc., undergo metamorphosis.

Q. 4. What are the stages of life cycle of a frog? (Medium)

Ans. Unlike mammals, frogs lay eggs. To increase the chances of survival, many eggs are laid in masses by the frog. Frog eggs can usually be found in calm or static waters. Stages of life cycle of a frog are: Egg → Tadpole → Froglet (young frog) → Adult frog.

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Learning the modes of reproduction in animals.
Learning process of asexual reproduction in microscopic organisms.
Knowing various parts of the male and female reproductive system.
Understanding the process of sexual reproduction.
Understanding the process of fertilisation and development of embryo.
Discussing the difference between viviparous and oviparous animals.

The process through which living beings produce new young ones of their own kind is called reproduction. Reproduction is necessary for the continuation of species, the transfer of variations from one generation to another and also for the addition of new species. This chapter deals with reproductive systems and various modes of reproduction in animals.

Frequently Asked Questions (FAQs) on Reproduction in Animals Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 8 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of reproduction in animals, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 8 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience.

Q5: How can students effectively prepare for case study questions on reproduction in animals for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on Reproduction in Animals class 8 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of reproduction in animals.

Q7: Which is the largest cell and smallest cell in the human body?

A7: Human reproductive system contains the largest cell (ovum) and smallest cell (sperm) in the human body.

Q8: Why the gametes have only half the number of chromosomes?

A8: Gametes are produced as a result of meiosis. In meiosis, a single cell divides into four haploid cells. The numbers of chromosomes are halved in meiosis and produces haploid gametes. Thus, the gametes have only half the number of chromosomes.

Q9: Define the term cloning.

A9: An artificial method invented by human beings to produce organ cell or part of living organisms without sexual or asexual reproduction. For example, sheep named Dolly was a clone.

Q10: Name the primary male and female sex hormones

A10: Testosterone is the primary male sex hormone produced by the testes and Estrogen or oestrogen is the primary female sex hormone secreted by ovaries.

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Chapter 9 Class 8 - Reproduction In Animals

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Get Notes, NCERT Solutions and Extra Questions of Chapter 9 Class 8 NCERT - Reproduction in Animals. Teachoo provides the best content to learn about Reproduction with NCERT questions, worksheets, extra questions and revision notes.

In this chapter, we will learn

What is Reproduction

Different Modes of Reproduction

What are Gametes

Reproduction in Human Beings

What is a Test Tube Baby ?

Internal and External Fertilization

Viviparous and Oviparous Animals

What is Metamorphosis

What is asexual reproduction ?

What purpose does the tail in a sperm serve ?

Why do fish and frogs lay eggs in hundreds whereas a hen lays only one egg at a time?

Here, we have divided this chapter into parts - Concepts, NCERT Questions and Extra Questions.

In Concepts , we explain the concept and then questions related to the concept are solved. In NCERT Questions , we have solved each and every question of the NCERT Book - you will find the best solutions at teachoo. And in Extra Questions , we provide Worksheets, practice questions for better understanding of the chapter... and to get more marks!

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NCERT Exemplar for Class 8 Science Solutions Chapter 9 Reproduction in Animals
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Class 8 Science NCERT Exemplar Solutions Chapter 9 Reproduction in Animals

Free PDF download of NCERT Exemplar for Class 8 Science Chapter 9 - Reproduction in Animals solved by expert Science teachers on Vedantu.com as per NCERT (CBSE) Book guidelines. All Chapter 9 - Reproduction in Animals exercise questions with solutions to help you to revise complete syllabus and score more marks in your examinations.

You can also Download NCERT Solutions for Class 8 Science to help you to revise complete Syllabus and score more marks in your examinations In this chapter of NCERT Exemplar Class 8 Science , several types of reproduction, such as asexual and sexual reproduction, are addressed.

Access Ncert Exemplar Solutions For Class 8 Biology Chapter 9: Reproduction in animals

Multiple choice questions.

1. Sets of reproductive terms are given below. Choose the set that has an incorrect combination.

(a) sperm, testis, sperm duct, penis

(b) menstruation, egg, oviduct, uterus

(d) ovulation, egg, oviduct, uterus

Ans: (c) sperm, oviduct, egg, uterus

The testis is responsible for the release of sperm. To ejaculate the sperm, the sperm duct opens up into the penis. During menstruation, the unfertilized egg is released via oviduct. In humans, sperm is discharged into the oviduct, where it fertilizes the egg, resulting in a zygote. The ovary produces eggs, which are then ovulated. Ovulation results in the release of the egg. The uterine tubes are also referred to as the oviduct.

Hence, option (c) is the right answer.

2. In humans, the development of fertilized eggs takes place in the

Ans: (c) oviduct

In humans, the fallopian tube is where the fertilized egg develops first (oviduct). After fertilization, the zygote enters the uterus on the third day (morula stage).

Hence, option (c) is the proper response.

3. In the list of animals given below, a hen is the odd one out.

human being, cow, dog, hen

The reason for this is

(a) it undergoes internal fertilization.

(b) it is oviparous.

(d) it undergoes external fertilization.

Ans: (b) it is oviparous.

Hens reproduce by laying eggs. It lays eggs with a calcium-rich shell. Internal fertilization allows sperm to fertilize the egg without passing through a thick calcium shell. Hence, option (b) is the proper response.

4. Animals exhibiting external fertilization produce a large number of gametes. Pick the appropriate reason from the following.

(a) The animals are small in size and want to produce more offspring.

(b) Food is available in plenty of water.

(d) Water promotes the production of a large number of gametes.

Ans: (c) To ensure better chance of fertilisation.

The process of fusion of male and female gametes outside the body or in the environment is known as external fertilization. Since there are only a few possibilities of fertilization when an animal releases gametes into the environment, a large number of male gametes are created to increase the chances of fertilization.

5. Reproduction by budding takes place in

(d) bacteria

Ans: (a) hydra

Budding is a form of asexual reproduction wherein the formation of a daughter from a tiny outgrowth on the parent body is termed bud. It can be found in sponges, coelenterates, yeast, and other organisms.

Hence, option (a) is the proper response.

6. Which of the following statements about reproduction in humans is correct?

(a) Fertilisation takes place externally.

(b) Fertilisation takes place in the testes.

(d) Fertilisation takes place in the human female.

Ans: (d) Fertilisation takes place in the human female.

The female reproductive system is intended to facilitate a variety of purposes. It produces ova, necessary for reproduction. The system is set up to convey the ova to the fertilization zone. Fertilisation occurs in the Fallopian tubes. The next step for fertilized eggs is to implant in the uterine walls and establish a pregnancy. Sperms can migrate past the cervix, into the uterus, and to the end of a fallopian tube after they enter the vaginal tract. Fertilization occurs when sperm can combine with an egg.

Hence, option (d) is the proper response.

7. In human beings, after fertilization, the structure which gets embedded in the wall of the uterus is

Ans: (d) zygote

The zygote is a single-celled entity that forms as a result of fertilization. A series of cell divisions occur in the zygote which results in the formation of a hollow cell mass known as the blastocyst.

8. Aquatic animals in which fertilization occurs in water are said to be:

(a) viviparous without fertilization.

(b) oviparous with external fertilization.

(d) oviparous with internal fertilization.

Ans: (b) oviparous with external fertilisation.

Fertilization occurs in water in aquatic animals. They release their gametes in water which further forms a zygote. They release their gametes in water which further forms a zygote. External fertilization is defined as fertilization that occurs outside of the body, whereas oviparous animals are those that develop their embryos in the egg.

Hence, option (b) is the proper response.

9. After fertilization, the resulting cell which gives rise to a new individual is the

Male and female gametes combine to produce a zygote after fertilization. The zygote transforms to become a two-cell embryo. The embryo then divides into stages, resulting in the production of morula and blastula. The embryo gives birth to a new individual.

10. In human beings, the correct sequence of events during reproduction is

(a) gamete formation, fertilisation, zygote, embryo

(b) embryo, zygote, fertilisation, gamete formation

(d) gamete formation, fertilisation, embryo, zygote

Ans: (a) gamete formation, fertilisation, zygote, embryo

Male and female gametes fuse to produce a new progeny in the process of sexual reproduction. Human reproduction begins with the development of male and female gametes, which are then fertilized to produce an embryo.

Both male and female gametes go through a meiotic cell division during the production of gametes.

Fertilization happens when male and female gametes are transferred and fused, resulting in the development of a diploid zygote.

Very Short Answer Questions

11. Although 2 cells called gametes fuse, the product formed is a single cell called a zygote. Justify.

Ans: The sperm and the ovum merge during the fertilization process. In order to produce the zygote, the contents of the sperm cell are transported into the egg. Hence, the product is a single-celled zygote.

12. Stages in the life cycle of silkworm are given below. Write them in sequential order.

pupa, silkworm, egg, silkmoth

Ans: The following is the right order of phases in the silkworm's life cycle:

13. What is the importance of reproduction?

Ans: The immediate purpose of reproduction is to save the populations from extinction.

14. In markets, eggs of birds are available but never eggs of dogs. Why?

Ans: Dogs do not lay eggs, instead, they produce puppies. As a result, there are no dog eggs in the market.

15. The eggs of frogs do not have shells for protection, yet they are safe in the water. How?

Ans: The eggs are covered with a jelly-like substance by the female frog, which causes them to float to the water's surface and protects them from damage.

Short Answer Questions

16. Fill up the blanks with the terms given below:

body, asexual, binary, single, nucleus

Amoeba is a ___________ celled organism. It reproduces by ___________ reproduction. The process of reproduction begins by the division of its ___________ into two. This is followed by the division of its ___________ into two. This type of reproduction is called ___________ fission.

Ans: Amoeba is a single-celled organism. It reproduces by asexual reproduction. The process of reproduction begins by the division of its nucleus into two. This is followed by the division of its body into two. This type of reproduction is called binary fission.

17. The term metamorphosis is not used while describing human development. Why?

Ans: Metamorphosis is a biological process in which an organism's form changes dramatically from one stage to the next in its life cycle, such as from the caterpillar to pupa and pupa to adult. Metamorphosis occurs in a variety of insects, fishes, amphibians, cnidarians, tunicates, and many more. Metamorphosis is not something that humans go through.

18. Mother gives birth to a baby but the baby has characters of both parents. How is this possible?

Ans: Due to sexual reproduction, the child possesses the characteristics of both the mother and father. The process of sexual reproduction involves the fertilization of male and female gametes, which results in the development of a zygote.

As a result of the two parents' genetic material being combined, a new creature is created, and the child possesses the characteristics of both parents.

19. How is reproduction in hydra different from that in amoeba?

Ans: Budding is an asexual reproduction method in which a new organism emerges from a bud or protrusion on the parent's body. Budding is the method by which Hydra reproduces. In binary fission, the parent cell divides into two daughter cells, such as in Amoeba.

20. State whether the following statements are True or False. If false, correct the statement:

(a) External fertilisation can occur both in water and on land.

Ans: False. External fertilization is only possible in the water.

(b) The eggs of fish are covered by hard shells for protection.

Ans: False. Fish eggs are protected by a jelly-like material.

Ans: False. Human sperm consists of three parts: a head, a middle section, and a tail.

(d) In adult human females, a single mature egg is released into an oviduct every month.

21. Why do only male gametes have a tail?

Ans: Male gametes (sperms) are motile. The tail helps the sperm swim through the female's reproductive tract and into the oviduct. The male reproductive system is where sperms are formed. Sperms are single-celled entities with a head, midsection, and tail. The acrosome, which is located at the tip of the sperm head, allows the sperm to reach the egg. The mitochondria, which provide the energy required for the tail to move, are located in the midpiece. To drive the sperm towards the egg, the tail swings back and forth in whip-like movements.

22. What does Fig. 9.1 represent?

Ans: This figure represents binary fission in the amoeba which involves the division of its nucleus into two followed by the division of its body into two.

23. Observe the figure given as Fig. 9.2 and answer the questions that follow.

(a) Label A and B.

Ans: A-Sperm B- Ovum

(b) Identify the process.

Ans: Fertilisation is the process.

Ans: Fertilisation results in the formation of the zygote.

Long Answer Questions

24. How can we say that fish exhibits external fertilization?

Ans: In an aquatic environment, external fertilization keeps the eggs from drying out. Male and female fish both release eggs and sperm into the sea. Sperm swim around in the water at random and come into contact with the eggs. The sperm nucleus travels into the egg and unites with it. External fertilization happens when fertilization takes place outside the female body, in water. Given that a vast majority of fish (>95 percent) experience external fertilization, it's only natural that the eggs develop outside the mother's body.

After observing Fig. 9.3 answer the following.

a. Read the following statements and label them in the figure:

(i) The part which produces female gametes.

(ii) The part where the development of the baby takes place.

Ans: Uterus

(iii) The part through which the developing embryo passes to reach the uterus.

Ans: Oviduct

b. Explain the future development of the embryo that would take place after it gets embedded in the uterus.

Ans: The zygote is formed once the egg and sperm have fused.

The blastula, which is lodged in the uterus, is formed by several divisions of the zygote. The embryo now proceeds through the gastrulation process, which results in the formation of three germ layers: endoderm, mesoderm, and ectoderm. The placenta develops next. Mesoderm is also linked to trophoblast tissue from the umbilical cord, which transfers nutrients and wastes from the fetal circulation to the placenta. The embryo then grows and takes on a human look in the last stage.

26. Hens and frogs are both oviparous exhibiting different types of fertilisations. Explain.

Ans: Internal fertilization occurs in hens. Inside the body, the fertilized egg grows into an embryo. The embryonic development of a chick, on the other hand, occurs outside the body.

Frogs are oviparous, which means that both zygote fertilization and embryo development take place outside the body.

27. Observe the following figures.

(i)Identify the stages (a) to (d) in Fig. 9.4 during the development of the human baby.

Ans: a) Embryo embedding in the uterus

b) Fertilisation

c) Zygote formation and embryo development

d) Zygote showing fusion of nuclei.

(ii) Arrange the stages in the correct sequence of development.

Ans: The correct sequence is as under:

(c), (b), (d), (a)

(iii) Explain the development that takes place in any one stage

Ans: Zygote formation

Introduction: Reproduction in Animals

The process by which one creature generates offspring is known as reproduction. It is one of the most fundamental processes in all known living forms. Every living creature we observe is a direct outcome of reproduction.

In animals and plants, there are two ways to reproduce:

There are several techniques of reproduction depending on the number of parents involved. Every living entity reproduces in one of two ways: through sexual reproduction or through asexual reproduction.

Sexual Reproduction

It's a type of reproduction in which gamete cells from two different organisms, one male and one female, unite to produce a single zygote. Half of this zygote's genetic information is shared with the father, while the other half is shared with the mother. There are many distinct mechanisms of sexual reproduction in both plants and animals, yet the principles remain the same. Both genetically and physiologically, the newly developed individual generated through sexual reproduction differs from its parents.

Asexual Reproduction

It is a type of reproduction in which just one organism participates. The offspring is genetically identical to the mother and nearly invariably has the same number of chromosomes as the mother. As a result, they are referred to as clones. They're also identical replicas of their parent cell.

It's an asexual reproduction method in which a single cell splits into two.

The nucleus is divided first, then other cell organelles in the cytoplasm, and lastly the cytoplasm itself.

As a result, one parent cell produces two offspring.

Amoeba is a good example. Amoeba reproduces by dividing into two cells, a process known as binary fission.

Multiple fission occurs when one parent cell produces a large number of daughter cells.

Budding

Budding is an asexual way of organism reproduction. The process of creating a new creature from a piece of the parent's body is explained in this video. It becomes detached whenever both genetically and physiologically, a bud is created. It becomes detached and develops into a new organism. As it matures, the newly evolved creature remains connected. The mature organism leaves scar tissues behind when it separates from the parent organism. The newly created creature is a genetic clone of the parent due to the fact that the reproduction is asexual. In Hydra, regenerative cells cause a bud to extend as an outgrowth after the repeated division of cells at the same location. These buds then evolved into new little individuals, which separate from the parent body once fully-fledged.

Cell Division

Cell division is at the heart of reproduction. Life cannot survive without cell division. Two separate types of cell divisions are involved in the two sorts of reproductive processes.

Mitosis occurs when a single cell divides into two identical daughter cells. A single division follows a single replication of DNA. In this form of division, the number of chromosomes is maintained. Asexual reproduction involves this form of division. It's also employed for tissue development, repair, and regeneration.

A single cell divides twice during meiosis to generate four haploid daughter cells. These cells are the gametes in males and females - the sperm and eggs. Two stages of the meiosis process occur. Each stage is further divided into stages.

Male Reproductive System

The testes, scrotum, spermatic ducts, male accessory glands, and penis are part of the male reproductive system. These organs collaborate to create sperm, the male gamete, male sex hormones, and other semen components. Both the reproductive and urinary systems include the penis and urethra. The remaining male reproductive system consists of the scrotum, seminal vesicles, vas deferens, testicles (testes), and prostate. The Penis has a cone-shaped root related to the structures of both the pelvic bones and the lower abdominal (visible section of the shaft) glands. The urethra's opening, located near the tip of the penis, is a conduit that transports sperm and urine. Corona refers to the base of the penis.

Female Reproductive System

The female reproductive system is designed to serve a variety of purposes. It produces ova, which are egg cells that are necessary for reproduction. The mechanism is set up to convey the eggs to the fertilization area. Along with the sperm, egg fertilization takes place in the Fallopian tubes. The next step for fertilized eggs is to implant them in the uterine walls and start the process of pregnancy. The female reproductive system is responsible for creating female sex hormones and the tasks listed above, which are necessary for the reproductive cycle to continue.

There are two ovaries in the female reproductive system and oviducts, uterus, vagina, cervix, and external genitalia.

These components, coupled with a pair of mammary glands that are functionally and physically connected, help in ovulation, fertilization, birth, and child care.

The principal female sex hormone released by the ovaries is estrogen, also known as estrogen. It is in charge of developing female reproductive organs, secondary sexual traits, the formation of the female gamete, the ovum, and the menstrual cycle maintenance.

The female gametes known as ovum or ova are produced by the ovary (plural). Every month, the right side ovary releases a single developed egg or ovum into humans’ oviduct/fallopian tube. The ovum is a single cell that is much bigger than sperm. The oviduct transports it to the uterus since it is non-motile.

Fertilization

Fertilization is the process of the male and female gametes fusing. Both haploid (single) chromosome-containing gametes merge, resulting in a diploid (double) number of chromosomes. A zygote is a name given to the fertilized ovum. Human fertilization occurs in the fallopian tube, and the zygote is subsequently transported to the uterus. It divides several times inside the uterus, expands, and develops into an embryo.

FAQs on NCERT Exemplar for Class 8 Science Solutions Chapter 9 Reproduction in Animals

1. What is Ovulation?

The function of releasing eggs from the ovaries is called ovulation. This occurs when the follicle has fully expanded and achieved its maximum size, accompanied by the collection of fluids within the follicle without a considerable increase in pressure. The stigma, or macula pellucida, emerges as a little oval-shaped patch jutting outward as a clear cone area when the follicle grows out and later experiences localized changes in color, integrity, and transparency. The maximal level of estrogen hormone release occurs just before ovulation. Ovulation happens at the stigma site after a rise of luteinizing hormone. This surge is required for ovulation to occur. Ovulation separates the. It follicle from the ovum, which is enclosed by the corona radiata by releasing follicular fluid. In the presence of spermatozoa, the cells of the corona radiata will separate later.

2. How does asexual Reproduction perform in Plants?

Sexually reproducing plants contain sex organs, which humans call flowers. Fusing male gametes, such as pollen, with female gametes, also known as ovules, is required for reproduction. A zygote and an endosperm nucleus are formed due to this union, which mature into seeds and fruits, respectively.

Some plants may reproduce asexually, without the need for blooms or pollen. Plants reproduce asexually in a variety of ways, both naturally and artificially. With the support of roots, a plant can produce offspring in the natural manner of asexual reproduction. Certain plants also use budding and cutting to reproduce asexually. Grafting, layering, cutting, and micropropagation are examples of human-induced asexual reproduction in plants.

3. How does binary fission take place in bacteria?

Binary fission is a fast process that varies depending on the species. The amount of time it takes bacteria to double their number of cells is known as doubling time. Furthermore, each species has its own set of circumstances to thrive. pH levels, temperature, oxygen, light, moisture, and osmotic pressure are examples of these circumstances. Mesophiles, for example, thrive in temperatures ranging from 20 to 45 degrees Celsius. Because the human body's ambient temperature is 37 degrees Celsius, many disease-causing microorganisms are mesophiles. The bacteria that causes TB in humans is Mycobacterium tuberculosis. Compared to other harmful bacteria such as Escherichia coli, which divides every 20 minutes, it divides every 15 to 20 hours. Extremophiles are on the other extreme of the spectrum. Challenging circumstances, such as high temperatures, high salinity, and highly acidic environments, are no match for these bacteria.

4. What is the Significance of Mitosis?

Mitosis is responsible for the zygote's transformation into an adult.

Each daughter cell receives an equal number of chromosomes. It is in charge of an individual's growth and development. It ensures that all of an organism's bodily cells have the same amount of chromosomes. Mitosis is necessary for asexual reproduction, vegetative propagation, and the repair and regeneration of damaged tissues in plants. Mitosis helps to keep the genome pure by preventing recombination and cross-over. It is in charge of repairing and regenerating old and damaged cells in animals, such as the gut epithelium, blood cells, and so on.

5. What do you mean by Menstrual Cycle?

After reaching adolescence, all females generate mature egg cells once a month during a process known as the menstrual cycle. An ovary releases a developed egg during this time, which goes to the uterus. If the egg is not fertilized in the uterus, the uterine lining sheds, and a new cycle begins. A menstrual cycle lasts 28 days on average, although it can be as short as 21 days or as long as 35 days in particular women. The endocrine system is in charge of the whole menstrual cycle, and the hormones involved include FSH, LH, estrogen, and progesterone. The pituitary gland produces FSH and LH hormones, whereas the ovaries generate estrogen and progesterone hormones. You can get all the details of Female Reproductive System Anatomy from Vedantu .

CBSE Class 8 Science Chapter 9 – Reproduction in Animals Class 8 Notes

Reproduction In Animals CBSE Class 8 Revision Notes

The reproduction in animals class 8 notes deals in the sexual reproduction that takes place amongst animals. The ninth chapter of Class 8 science is a great way of making students understands the biological process of reproduction. In addition, it will help you to learn about the various reproductive organs in both females and males. Students will be made familiar with the fertilisation method as well. After that, the transformation of young ones to adults will also be discussed here.

Similarly, the chapter also throws light on asexual reproduction. For instance, it explains the life cycle of a frog for the same. This chapter is quite important from the examination point of view. Moreover, it will help the students in learning in detail about reproduction in animals and humans. Thus, you will also get diagrammatic representations for a clearer and better understanding of the chapter.

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Sub-topics covered under Reproduction in Animals :

Asexual Mode of Reproduction
Sexual Reproduction

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CBSE Class 8 Science Chapter 10 – Reaching The Age of Adolescence Class 8 Notes
CBSE Class 8 Science Chapter 6 – Combustion and Flame Class 8 Notes
CBSE Class 8 Science Chapter 11 – Force and Pressure Class 8 Notes
CBSE Class 8 Science Chapter 12 – Friction Class 8 Notes
CBSE Class 8 Science Chapter 13 – Sound Class 8 Notes
CBSE Class 8 Science Chapter 14 – Chemical Effects of Electric Current Class 8 Notes
Metals and Non-Metals Class 8 Notes – CBSE Class 8 Science Chapter 4

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Reproduction in Animals

Class 8 - ncert science solutions.

Explain the importance of reproduction in organisms.

Reproduction is essential for the continuation of a species. It ensures the continuation of similar kinds of individuals, generation after generation and prevents them from becoming extinct.

Describe the process of fertilisation in human beings.

When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilisation. During fertilisation, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilised egg or zygote.

Question 3(a)

Internal fertilisation occurs

in female body.
outside female body.
in male body.
outside male body.

in female body

Reason — Fertilisation takes place inside the oviduct in the female body. Hence, it is called internal fertilisation.

Question 3(b)

A tadpole develops into an adult frog by the process of

fertilisation

metamorphosis

Reason — The transformation of the larva into adult through drastic changes is called metamorphosis. The tadpoles look like fish and are capable of swimming and transform into adults capable of jumping and swimming.

Question 3(c)

The number of nuclei present in a zygote is

Reason — During fertilisation, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilised egg or zygote.

Indicate whether the following statements are True or False.

(a) Oviparous animals give birth to young ones.

(b) Each sperm is a single cell.

(d) A new human individual develops from a cell called gamete.

(e) Egg laid after fertilisation is made up of a single cell.

(f) Amoeba reproduces by budding.

(g) Fertilisation is necessary even in asexual reproduction.

(h) Binary fission is a method of asexual reproduction.

(i) A zygote is formed as a result of fertilisation.

(j) An embryo is made up of a single cell.

(a) False Corrected statement — Viviparous animals give birth to young ones.

(d) False Corrected statement — A new human individual develops from a cell called zygote.

(f) False Corrected statement — Amoeba reproduces by binary fission.

(g) False Corrected statement — Fertilisation is not necessary in asexual reproduction.

(j) False Corrected statement — A zygote is made up of a single cell.

Give two differences between a zygote and a foetus.

Define asexual reproduction. Describe two methods of asexual reproduction in animals.

Asexual reproduction is the type of reproduction in which only a single parent is involved. It takes place by different methods like budding, binary fission etc.

Two methods of asexual reproduction in animals are:

Budding — In budding, new individuals develop from buds. A bulge or outgrowth appears on the parent's body that goes on to develop into a full organism. It then detaches from the parent and continues to develop into a new individual. Budding is seen in hydra and yeast.
Binary Fission — In binary fission, a single-celled organism divides to form two new individuals. The process begins with the division of its nucleus into two nuclei. This is followed by division of its body into two, each part receiving a nucleus. Finally, two cells are produced from one parent cell. It is seen in Amoeba.

In which female reproductive organ does the embryo get embedded?

The embryo gets embedded in the wall of the uterus of females for further development.

What is metamorphosis? Give examples.

The transformation of the larva into an adult through drastic changes is called metamorphosis. For example, it is seen in frog and butterfly. In frogs, there are three distinct stages, that is, egg, tadpole (larva) and adult. In butterfly the four distinct stages are egg, caterpillar, pupa and adult.

Differentiate between internal fertilisation and external fertilisation.

Question 10

Complete the crossword puzzle using the hints given below.

1. The process of the fusion of the gametes. 6. The type of fertilisation in hen. 7. The term used for bulges observed on the sides of the body of hydra. 8. Eggs are produced here.

2. Sperms are produced in these male reproductive organs. 3. Another term for in vitro fertilisation. 4. These animals lay eggs. 5. A type of fission in amoeba.

The solution of word puzzle is given below:

1. Fertilisation. 6. Internal. 7. Buds. 8. Ovary.

2. Testes. 3. IVF. 4. Oviparous. 5. Binary.

Reproduction in Animals Class 8 Science Extra Questions and Answers

Reproduction in Animals Class 8 Science Chapter 9 Extra Questions with Answers are provided here. We prepared these extra questions based on the latest NCERT Class 8 Science Book. CBSE Class 8 Science Chapter 9 Reproduction in Animals Extra Questions will help you to properly understand a particular concept of the chapter.

Class 8 Science Chapter 9 Reproduction in Animals Extra Questions

Very short answer type question.

Question 1: Name two animals which reproduce sexually.

Answer: Cow, Elephant

Question 2: Name two animals which reproduce asexually.

Answer: Hydra, Amoeba

Question 3: Which type of reproduction involves gametes?

Answer: Sexual reproduction

Question 4: Which type of reproduction does not involve gametes?

Answer: Asexual reproduction

Question 5: What is another term for a fertilised egg?

Answer: Zygote

Question 6: Name the reproductive process which involves two parents.

Question 7: Name the reproductive process which involves one parent.

Question 8: What type of fertilization takes place in hen?

Answer: Internal fertilization takes place in hen.

Question 9: Name the organs which produce sperms in human.

Answer: The testes produce sperms in human.

Question 10: What are the male gametes in humans called?

Answer: The male gametes in humans are called sperms.

Question 11: What are the female gametes in humans called?

Ans. Female gametes in humans are called ova (eggs).

Question 12: Name the organs which produce female gametes.

Answer: Ovaries produce female gametes.

Question 13: Name the parent sheep of which dolly was a clone.

Answer: Finn Dorsett sheep

Question 14: Where does a fertilized egg (or zygote) develop into a baby?

Answer: A fertilized egg (or zygote) develops into a baby in the uterus.

Question 15: What are the reproductive organs of male?

Answer: The reproductive organs in male include testes, sperm ducts and penis.

Question 16: What term is used for bulges observed on the sides of the body of hydra?

Answer: Buds

Question 17: What is the name given to the fusion of male and female gametes?

Answer: Fertilization is the name given to the fusion of male and female gametes.

Question 18: What are the reproductive organs of female?

Answer: The reproductive organs in the female include ovaries, oviducts and uterus.

Question 19: What is foetus?

Answer: The stage of the embryo in which all the body parts can be identified is called a foetus.

Question 20: In which female reproductive organ does the embryo get embedded?

Ans. The embryo gets embedded in the wall of the uterus for further development.

Short Answer Type Questions

Question 1: What type of asexual reproduction take place in amoeba?

Answer: Amoeba reproduces by the common asexual reproduction method called binary fission.

Question 2: Who cloned Dolly the sheep?

Answer: Dolly was cloned by Ian Wilmut and his colleagues at the Roslin Institute in Edinburgh, Scotland.

Question 3: What purpose does the tail in a sperm serve?

Answer: Tail allows the sperm to become motile, hence helps the sperm to reach female gametes for fusion.

Question 4: What is cloning?

Answer: Cloning is the production of an exact copy of a cell, any other living part, or a complete organism.

Question 5: What are the two modes of reproduction in animals?

Answer: There are two modes by which animals reproduce. These are: (i) Sexual reproduction, and (ii) Asexual reproduction.

Question 6: What are the reproductive organs in humans which produce the gametes?

Answer: The ovary produces female gametes called ova and the testes produce male gametes called sperms.

Question 7: Which life process ensures that a plant or animal species will not disappear from the earth?

Answer: Reproduction is the life process ensures that a plant or animal species will not disappear from the earth.

Question 8: Explain the importance of reproduction in organisms.

Answer: Reproduction is essential for the continuation of a species. It ensures the continuation of similar kinds of individuals, generation after generation.

Question 9: What is an embryo?

Answer: The zygote divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is termed as an embryo.

Question 10: Name the technique which is used to help a woman with blocked oviducts to have a baby.

Answer: . IVF or in vitro fertilization (fertilization outside the body) is the technique which is used to help a woman with blocked oviducts to have a baby.

Long Answer Type Questions

Question 1: Describe the process of fertilization in human beings.

Answer: The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote.

Question 2: How does a hydra reproduce?

Answer: Hydra reproduces asexually by the process of budding. A small outgrowth called ‘bud’ is formed on the side of its body. This bud then grows gradually to form a small hydra. And finally the tiny new hydra detaches itself from the body of parent hydra and lives as a separate organism.

Class 8 Science Chapter 9 Reproduction in Animals Extra Questions image 1

Question 3: Give two differences between a zygote and a foetus.

Answer: Differences between a zygote and a foetus

Question 4: Give two differences between zygote and embryo.

Answer: Differences between zygote and embryo

Question 5: Why do fish and frogs lay eggs in hundreds?

Answer: Though these animals lay hundreds of eggs and release millions of sperms, all the eggs do not get fertilized and develop into new individuals. This is because the eggs and sperms get exposed to water movement, wind and rainfall. Also, there are other animals in the pond which may feed on eggs. Thus, production of large number of eggs and sperms is necessary to ensure fertilization of at least a few of them.

Question 6: Explain how chicks are born.

Answer: Internal fertilization takes place in hens also. Soon after fertilization, the zygote divides repeatedly and travels down the oviduct. As it travels down, many protective layers are formed around it. The hard shell that we see in a hen’s egg is one such protective layer. After the hard shell is formed around the developing embryo, the hen finally lays the egg. The embryo takes about 3 weeks to develop into a chick.

Question 7: Define asexual reproduction. Describe two methods of asexual reproduction in animals.

Answer: The type of reproduction in which only a single parent is involved is called asexual reproduction. The two methods of asexual reproduction in animals are:

Budding – In this type of asexual reproduction, a small part of the body of the parent organism grows as a ‘bud’ which then detaches and becomes a new organism. Example- hydra

Binary fission – In this type of asexual reproduction, the parent organism splits (or divides) to form two new organisms. Example – Amoeba reproduces by binary fission by dividing itself into two parts.

Question 8: Differentiate between Viviparous and Oviparous Animals.

Answer: Difference between Viviparous and Oviparous Animals

Question 9: What is the basic difference between asexual and sexual reproduction?

Answer: Difference between asexual and sexual reproduction

Question 10: Differentiate between internal fertilization and external fertilization.

Answer: Difference between internal fertilization and external fertilization

Question 11: What is metamorphosis? Give examples.

Answer: The transformation of the larva into adult through drastic changes is called metamorphosis. Commonly known examples of metamorphosis include the process undergone by most insects and the transformation of tadpoles into frogs. The diagram below shows the stages of this change, wherein the small fish-like tadpoles transform into what seems a completely different animal:

Class 8 Science Chapter 9 Reproduction in Animals Extra Questions image 2

Question 12: How does fertilization take place in frog? Or How do frog eggs get fertilized? Or How does fertilization occur in frog?

Answer: During spring or rainy season, frogs and toads move to ponds and slow flowing streams. When the male and female come together in water, the female lays hundreds of eggs. Frog’s egg is not covered by a shell and it is comparatively very delicate. A layer of jelly holds the eggs together and provides protection to the eggs. As the eggs are laid, the male deposits sperms over them. Each sperm swims randomly in water with the help of its long tail. The sperms come in contact with the eggs. This results in fertilization.

Question 13: What is ‘in vitro fertilization’ technique of reproduction? Or What are test-tube babies?

Answer: In some women oviducts are blocked. These women are unable to bear babies because sperms cannot reach the egg for fertilization. In such cases, doctors collect freshly released egg and sperms and keep them together for a few hours for IVF or in vitro fertilization (fertilization outside the body). In case fertilization occurs, the zygote is allowed to develop for about a week and then it is placed in the mother’s uterus. Complete development takes place in the uterus and the baby is born like any other baby. Babies born through this technique are called test-tube babies.

Question 14: How could a single cell become such a big individual?

Answer: Fertilization results in the formation of zygote. The zygote divides repeatedly to give rise to a ball of cells. The cells then begin to form groups that develop into different tissues and organs of the body. This developing structure is termed an embryo. The embryo gets embedded in the wall of the uterus for further development. The embryo continues to develop in the uterus. It gradually develops the body parts such as hands, legs, head, eyes, ears, etc. The stage of the embryo in which all the body parts can be identified is called a foetus. When the development of the foetus is complete, the mother gives birth to the baby.

Question 15: What are the steps involved in sexual reproduction in animals?

Answer: Steps involved in sexual reproduction in animals are:

The male parent produces male gametes called sperms. Sperm is a single cell with all the usual cell components.
The female parent produces female gametes called eggs (or ova). Like the sperm, an egg is also a single cell.
The sperm enters into the egg. The nucleus of sperm fuses with the nucleus of egg cell to form a new cell called zygote.
The zygote divides repeatedly to form a hollow ball of hundreds of cells which is called embryo.
Embryo grows and becomes a foetus in which all main body features of the baby animal have formed.
Foetus grows and develops to form a new baby animal.

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UP Class 8th Science

Course: up class 8th science > unit 7, reproduction in animals.

(Choice A) Fragmentation A Fragmentation
(Choice B) Budding B Budding
(Choice C) Binary fission C Binary fission

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Important Questions Class 8 Science Chapter 9

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Important Questions Class 8 Science Chapter 9 – Reproduction in Animals

Science Chapter 9 of Class 8 is about reproduction in animals. This chapter is about learning the different modes of reproduction, like sexual reproduction and asexual reproduction. In the sexual reproduction part, the students will learn about the male reproductive organs, female reproductive organs, and fertilisation. In the asexual reproduction part, the students will learn about budding and binary fission.

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Our Science subject experts understand the importance of frequently solving questions to gain a better understanding of different Science chapters. Our team has carefully chosen questions from different sources including NCERT textbook, NCERT exemplars, past year question papers, and other reference books. Students can refer to our question bank of Chapter 9 Class 8 Science Important Questions to get access to these questions and their answers.

For each question, there is a step-by-step self-explainable answer that helps students to revise the chapter concepts. The question bank of Important Questions Class 8 Science Chapter 9 is accessible to students after registering on our website.

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You can also find CBSE Class 8 Science Chapter-by-Chapter Important Questions here:

Important Questions Class 8 Science Chapter 9 – With Solutions

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We at Extramarks take our role seriously to provide the best resources to the students and help them get excellent grades. The question bank has a variety of question formats including MCQs, short answers, long answers, etc. They represent exam-pattern questions and help students to be more confident while answering the actual exam questions.

Given below are a set of few questions and their answers from our question bank of Important Questions Class 8 Science Chapter 9. Students after solving these questions will also get to revise the entire chapter.

Question 1. Sets of reproductive terms are given below. Choose the set that has an incorrect combination.

sperm, testis, sperm duct, penis
menstruation, egg, oviduct, uterus
sperm, oviduct, egg, uterus
ovulation, egg, oviduct, uterus
C) Sperm → oviduct, egg → uterus

Reproduction is a process in which organisms make more organisms similar to themselves. Millions of these sperm are in this small amount of semen, and they swim up from the vagina through the cervix following the uterus to meet the egg present in the fallopian tube. It takes sperm to fertilise the egg.

Around 5 to 6 days after the sperm fertilises the egg, the fertilised egg becomes a multicelled blastocyst.
A blastocyst is the size of a pinhead, a hollow ball of cells with fluid inside. The blastocyst burrows itself into the uterus lining, called the endometrium.
The oestrogen hormone causes the endometrium to become thick and rich in blood.
Progesterone hormone, released by each of the ovaries, keeps the endometrium thick with blood through which the blastocyst may attach to the uterus and absorb nutrients.
This process is called implantation.

Question 2. Explain the embryo’s future development after it gets embedded in the uterus.

The developing embryo gets embedded in the uterus wall for further development. The embryo continues to develop inside the uterus. It eventually develops body parts such as hands, legs, eyes, head, ears etc. The stage of an embryo in which all the parts of the body can be identified is known as a foetus. When the development of the foetus is completed, the mother gives birth to the baby.

Question 3. How is reproduction in hydra different from that in Amoeba?

Amoeba is a unicellular organism that can change its shape. It is generally found in water bodies like ponds, lakes and slow-moving rivers.

Binary fission in Amoeba

Initially, the pseudopodia are retrieved. The body of an amoeba is coiled and becomes round.
Amitosis is observed, and the nucleus’s division occurs, followed by the cytoplasm’s splitting.
Constriction starts to develop at the point of fission in the amoeba body.
The furrow or constriction turns deeper, resulting in the formation of two daughter cells.

Budding in Hydra

Hydra is a freshwater organism, having different species.
Hydra uses regenerative cells for reproduction, where a bud expands as an outgrowth because of repeated cell division at one specific location.
These buds then develop into new small individuals who, when completely matured, detach from the parent body.

Question 4. Define asexual reproduction. Explain one method of asexual reproduction in animals.

The continuity of generation in society is a common process. Everyone wants to see the next generation. This process is termed reproduction. The process through which organisms give birth to young, new organisms of the same kind is known as reproduction. There are two main types of reproduction. Sexual and asexual are two types of reproduction. This article will read about asexual reproduction.

Asexual reproduction is the mode of reproduction involved in producing offspring by a single parent. Asexual reproduction is the mode of reproduction in which a single parent produces new offspring. The new individuals produced are physically and genetically identical to each other.

The following are the important features of asexual reproduction:

A single parent is involved.
This process of reproduction occurs in a short time.
No fertilisation or gamete formation takes place.
The offspring is genetically similar.
The organisms multiply and grow rapidly.

Types of asexual reproduction

There are various types of asexual reproduction:

Binary Fission
Fragmentation
Vegetative Propagation
Sporogenesis

Binary fission

The term “fission” indicates “to divide”. Through binary fission, the parent cell gets divided into two cells. The cell division patterns vary in various organisms, i.e., some are directional while others are non-directional.

Example: Amoeba and euglena show binary fission.

It is one of the most simplest and uncomplicated methods of asexual reproduction. The parent cell gets divided into two, each daughter cell containing a nucleus of its own that is genetically identical to its parent. The cytoplasm also takes part in division, leading to two equal-sized genetically identical daughter cells. The process repeats itself, and these daughter cells grow and further divide.

Question 5. The hen is odd in the list of animals given below. (human beings, cows, dogs, hens). The reason for it is

it undergoes internal fertilisation.
It is oviparous.
It is viviparous.
It undergoes external fertilisation.
B) It is oviparous

Here, the hen is the odd one out because it is oviparous, i.e. it lays an egg from which young ones are hatched later. Viviparous animals undergo internal fertilisation, and the embryo develops inside the mother until a young one is born. The ovoviviparous animals produce eggs, but the eggs develop inside the mother, and a live organism is born. However, unlike viviparous animals, ovoviviparous animals do not have a placenta. Ovoviviparous animals are born alive.

Examples of oviparous are birds and reptiles.
Examples of viviparous species are snakes and sharks.

Question 6. Although two cells called gametes fuse, the product formed is a single cell called the zygote. Justify.

During the process of fertilisation, the sperm gets fused with the egg cell. The content of the sperm cell gets transferred into the egg to form the zygote. Hence, the product formed is a single-celled zygote. A zygote is the first diploid cell formed by the fusion of female and male gametes resulting in the formation of an embryo.

The zygote rapidly divides in the initial 12-24 hours of formation.

The cell mass forms a hollow ball during the process of blastulation.

Cells start differentiating and forming cavities.

The three germ layers form during gastrulation.

Formation of primitive streak is followed by notochord formation

Tubes get formed, making a neurula.

The notochord forms into the neural plate.

The neural plate folds to form a neural tube and crest.

The mesoderm gets divided into axial, paraxial, intermediate and lateral plate mesoderm, which gives rise to different organs.

Question 7. Why do only male gametes have a tail?

Male gametes or sperms are motile. The tail of the sperm helps the sperm swim through the female’s reproductive tract to reach the oviduct. The male gametes, i.e., sperms, are produced within the male reproductive system. Sperms are small unicellular structures with a head, middle piece, and tail.

The tip of the sperm head is a portion called the acrosome that enables the sperm to penetrate the egg.
The midpiece has the mitochondria that supply the energy the tail needs to move and swim.
The tail moves in whip-like movements back and forth to propel the sperm toward the egg.

Question 8. How can we say that fish exhibit external fertilisation?

External fertilisation in fish:

External fertilisation is the process where the fusion of male and female gametes occurs in the outside environment.
The female fish lays its eggs in the surrounding water environment, and the male sperm travels towards the egg randomly in the water.
The nucleus of sperm moves into the egg and fuses with it.
Due to water as the external environment, the female eggs do not dry out in case of external fertilisation.
Since fertilisation occurs in water, outside the female body, it is external fertilisation.
Hence, we can say that fish exhibit external fertilisation.

Question 9. In which female reproductive organ does the embryo get embedded?

The embryo gets embedded in the uterus of the female reproductive system. The female reproductive organ is where the embryo gets embedded in the uterus wall. It is here that the embryo continues its development.

Question 10. What is the uterus?

The uterus is a hollow muscular structure seen in the pelvic region of females between the rectum and the bladder. The uterus’s main function is to nourish the developing foetus until birth.

Over the gestation period which is 9 months in humans, the embryo develops its body parts such as hands, ears, eyes, nose, legs, etc. There is an embryonic stage wherein all body parts can be distinguished, and the embryo has then termed the foetus.

Question 11. Aquatic animals where fertilisation occurs in water are said to be:

Viviparous without fertilisation.
Oviparous with external fertilisation.
Ovoviviparous with internal fertilisation.
Oviparous with internal fertilisation.
b) oviparous with external fertilisation.

Fertilisation that occurs on the outside of the body of an organism is known as external fertilisation. It normally requires a water body for successful fertilisation.

It results in increased genetic variations.
It produces a larger number of offspring.
The gametes released can drift, making it easy to find mates.

The female releases its eggs in the water. The male also releases the sperm in the water for fertilising them. The larval life of frogs is in water, whereas the adult life is on land.

Question 12. The eggs of frogs do not have shells for protection, yet they are safe in the water. How?

Answer 12.

Frog’s eggs are present without any external covering or shell, but a layer of jelly holds the eggs together, thus providing them protection. This jelly or thick covering also protects them from drying up and prevents them from being eaten by other predators or animals.

In a female frog, the pair of ovaries produce an ovum and pass it to the oviduct, which opens into the cloaca. The cloaca is a common pathway for the process of excretion and reproduction. At a time, 2500 to 3000 eggs are laid and fertilised externally.

Question 13. Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.

Hens are oviparous in nature, in which internal fertilisation takes place. The fertilised egg develops into an embryo inside the body. Frogs are oviparous, in which fertilisation and development of zygote to the embryo and young ones occur outside the body.

Internal fertilisation occurs in hens. The fertilised egg is enclosed in a protective shell covering the hen’s body and is laid outside for development.
In frogs, fertilisation and development of zygotes occur outside their body, that is, external fertilisation.

Question 14. The term metamorphosis is not used while describing human development. Why?

In human beings, the body parts of an adult are present from the time of birth. In the metamorphosis process, the parts of the adult are different from those at the time of birth. Metamorphosis does not occur in humans and other viviparous animals because their offspring are entirely formed inside their mother’s womb. They do not require any further differentiation of their body parts. However, the body parts grow and develop to reach maturity after birth.

Question 15. Explain the importance of reproduction in living organisms.

Reproduction is the process of producing or giving birth to an offspring. There are generally two forms of reproduction – Asexual and sexual reproduction.

Here are some points highlighting the importance of reproducing in living organisms:

It’s very critical for any species to reproduce to continue their species. Else that species would become extinct.
Reproduction plays a crucial role in organisms evolution as it creates small variations via genetic recombinations over generations.
Having a healthy balance is very important for any ecosystem. Reproduction helps to increase the number of species ensuring a good ecosystem balance.

Question 16. Which of the following statements about reproduction in humans is correct?

Fertilisation takes place externally.
Fertilisation takes place in the testes.
During fertilisation, the egg moves towards the sperm.
Fertilisation takes place in the human female.
D) Fertilisation takes place in the human female (oviduct).

The female reproductive system is framed in such a way to perform different functions. It makes egg cells that are essential for reproduction, called ova. The system is organised for delivering the ova to the region of fertilisation. The egg fertilisation takes place in the fallopian tubes along with the sperm. Implanting in the uterus’s walls and initiating the pregnancy stages is the next step for fertilised eggs. Once sperm enter the vagina, they can move through the cervix, into the uterus, and to the end of a fallopian tube. If sperm can fuse with an egg, fertilisation takes place.

Question 17. A mother gives birth to a baby, but the baby has the characteristics of both parents. How is this possible?

Though the mother gives rise to a baby, fertilisation involves the fusion of gametes from both parents. Hence, the character is obtained by both parents. The zygote, therefore, has both father’s and mother’s contributions. Since the zygote develops into the baby, it has the characteristics of both parents.

The term used for describing the fusion of the female and male gametes is fertilisation.
Fertilisation can also be described as the fusion of the male gametes with the female gametes to form a diploid zygote.
It is a process that occurs after the process of pollination of the carpel. The complete sequence of the process takes place in the zygote to develop into a seed.

Question 18. In markets, birds’ eggs are available but never dogs’ eggs. Why?

Dogs are viviparous. Dogs do not lay eggs, and it gives birth to puppies. Hence, dog eggs are not available in the market. Birds lay their eggs, Birds are oviparous, hence, their eggs are easily available in the market,

Oviparity refers to a mode of reproduction in which animals lay eggs. These eggs are released into the external environment. Thus, these embryos develop on the outside of the mother’s body. Here, egg yolk nourishes the developing embryo.
Viviparity refers to the mode of reproduction through which animals directly give birth to their young ones. Therefore, viviparous animals give birth to their young ones without laying eggs. Fertilisation takes place internally inside the female organism.

Question 19. What is metamorphosis? Give examples.

In many living species, the young one or the offspring does not resemble the adult. This is known as indirect development and such a young one is known as a larva or nymph. The process of changing from a nymph or larva to an adult body is known as metamorphosis. This transformation of a larva or nymph into an adult is characterised by a series of morphological, behavioural and physiological changes.

Examples include frogs, butterflies, etc.

State two differences between a zygote and a foetus.
It is the earliest stage of development
It is a single cell
It is formed by the fusion of male and female gametes
The zygote usually lasts a week and then develops into its next stage.
The zygote gets divided several times to form an embryo
It is the last developmental stage of an organism
The embryo stage shows all a mature organism’s main recognizable body parts.
The foetus stage usually occurs after the embryo stage.
Foetus mainly undergoes internal development.

Question 20. Differentiate between internal fertilisation and external fertilisation.

Fertilisation is generally defined as the fusion of a male and a female gamete.

Internal fertilisation occurs inside the female body.

There are higher chances of survival of the offspring.

Internal fertilisation protects fertilised eggs or embryos from harsh environments.

Examples are cows, humans, dogs, monkeys, etc.

External fertilisation

It occurs on the outside of the female body.

There are low chances of survival of the offspring.

Most aquatic animals use this type of fertilisation, and the advantage of external fertilisation is that it produces many offspring due to external hazards. Examples are fish, frogs, organisms etc.

Question 21. Reproduction by budding takes place in

paramecium

Reproduction in all the given organisms takes place through asexual methods. Hydra reproduces by forming buds on its body surface, which develops into a new organism. Amoeba, paramecium and bacteria multiply by dividing themselves into two parts, i.e. by binary fission method. Budding is an asexual mode of producing new organisms. In this process, an organism is developed from a small part of the parent’s body.

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Q.1 Solid sodium chloride does not conduct electricity while molten sodium chloride conducts. Explain why?

Marks: 2 Ans

Solid sodium chloride does not conduct electricity because the particles (ions) are held together by strong forces of electrostatic attraction. In molten state the ions become free and move to conduct electricity, since on heating the bonds between ions become weak.

Q.2 Why is an acid or an ionic salt added to water in the electrolysis of water?

Pure water or distilled water is a bad conductor of electricity whereas acids and bases are good conductors of electricity. When an acid or ionic salts are dissolved in distilled water then the resulting solution conducts electricity.

Q.3 Define electrolysis.

Marks: 1 Ans

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Cbse class 8 science important questions, chapter 1 - crop production and management.

Chapter 2 - Microorganisms : Friend and Foe

Chapter 3 - synthetic fibres and plastics, chapter 4 - materials : metals and non-metals, chapter 5 - coal and petroleum, chapter 6 - combustion and flame, chapter 7 - conservation of plants and animals, chapter 8 - cell - structure and functions, chapter 10 - reaching the age of adolescence, chapter 11 - force and pressure, chapter 12 - friction, chapter 13 - sound, chapter 14 - chemical effects of electric current, chapter 15 - some natural phenomena, chapter 16 - light, chapter 17 - stars and the solar system, chapter 18 - pollution of air and water, faqs (frequently asked questions), 1. apart from the ncert textbook, where can i find good study resources for class 8 science.

You can find the important study materials for Class 8 Science on the Extramarks official website. Our study materials cover all important topics from sources like NCERT textbooks, NCERT exemplar and other reference sources related to the CBSE curriculum. You can build your confidence and improve your scores by practising and revising from our study resources. The important questions and their solutions will help you to clarify your concepts which will come handy while answering difficult questions in the exams..

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2. How many chapters are there in CBSE Class 8 Science syllabus?

Many important chapters that form the base of Class 9 and Class 10 Science are covered in CBSE Class 8 Science syllabus. Here is a complete list of these eighteen chapters:

Chapter 1 Crop Production and Management
Chapter 2 Microorganisms: Friend and Foe
Chapter 3 Synthetic Fibres and Plastics
Chapter 4 Materials: Metals and Non-Metals
Chapter 5 Coal and Petroleum
Chapter 6 Combustion and Flame
Chapter 7 Conservation of Plants and Animals
Chapter 8 Cell – Structure and Functions
Chapter 9 Reproduction in Animals
Chapter 10 Reaching the Age of Adolescence
Chapter 11 Force and Pressure
Chapter 12 Friction
Chapter 13 Sound
Chapter 14 Chemical Effects of Electric Current
Chapter 15 Some Natural Phenomena
Chapter 16 Light
Chapter 17 Stars and The Solar System

Chapter 18 Pollution of Air and Water

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Notes of Ch 9 Reproduction in Animals| Class 8th Science

Study material and notes of ch 9 reproduction in animals class 8th science.

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CBSE Notes For Class 8
Class 8 Science Notes
Chapter 9: Reproduction In Animals

Reproduction in Animals Class 8 Notes - Chapter 9

According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 6.

Introduction to Reproduction

Reproduction is the process of giving rise to offspring.
Reproduction is essential for the continuation of a species.
There are two modes of reproduction:

Sexual reproduction

Asexual reproduction.

The type of reproduction in which only a single parent is involved is called asexual reproduction.

There is no mixing of genetic information.
For example, buds in Hydra

The type of reproduction, which involves two parents to give rise to an offspring is called sexual reproduction.

The males and females have different reproductive parts or organs.
These organs produce the male and female gametes, which fuse together to form the offspring.
Genetic information from both parents is inherited.
For example, humans

To know more about Modes of Reproduction, visit here .

It is a type of asexual reproduction in which a single-celled organism divides into two.

Division of a nucleus is followed by the division of other cell organelles in the cytoplasm and finally the cytoplasm.
Thus, two cells are produced from one parent cell.
Example: Amoeba.
Amoeba reproduces by binary fission, which is dividing into two cells.

If one parent cell gives rise to many daughter cells, this type of fission is called multiple fission.

To know more about Binary Fission, visit here .

A bud starts as an outgrowth of the parent body.
As this bud grows, it becomes a new individual organism.
In some organisms, the buds remain attached to the parent’s body (example: yeast)
In some organisms, it detaches from the parent body and develops into a completely mature individual (hydra).
This type of reproduction is called budding.

To know more about Budding, visit here .

Cell Division

Reproduction essentially involves cell division.
Without cell division, life will not propagate.
The two types of reproductive processes involve two different types of cell divisions.

Cell division is the process in which a parent cell divides into two or more daughter cells.

Cell division provides more cells:

Regeneration
Repair and damage control
Gamete formation

To know more about Cell Division, visit here .

There are two types of cell division:

Mitosis is a process where a single cell divides into two identical daughter cells.

DNA replication occurs once, followed by a single division.
The number of chromosomes is maintained in this type of division.
This type of division happens in asexual reproduction.
It is also used for growth, repair and regeneration of tissues.

To know more about Mitosis, visit here .

This is a cell division in which a single cell divides into four haploid cells.

DNA replication occurs once followed by two divisions.
The number of chromosomes are halved in meiosis.
Meiosis takes place in sex organs to produce haploid gametes.
Thus, the gametes have only half the number of chromosomes in them.

To know more about Meiosis, visit here .

Sexual Reproduction in Humans

To know more about Male and Female Reproductive System, visit here .

Male reproductive system

The male reproductive system consists of a pair of testes, a pair of sperm ducts and a penis .
The testes are located outside the male body.
Sperms are produced in testes.
Sperms are the male gametes.

To know more about the Male Reproductive System, visit here .

Testosterone

Testosterone is the primary male sex hormone and is produced by the testes.
Testosterone is responsible for the development of sex organs, the production of sperm and also the development of secondary sexual characteristics.
Sperms are the male gametes produced by testes in humans.
Millions of sperms are produced by the testes in a day.
Each sperm is a single, microscopic cell having a head, a middle piece and a tail as its parts.
The head contains a nucleus with a single set of chromosomes.
The middle piece contains a large number of mitochondria that provide energy during active movement.
Sperm is a motile gamete which moves through the female reproductive tract with the help of the tail.

Female reproductive system

The female reproductive system consists of a pair of ovaries, a pair of fallopian tubes (oviducts) and a single uterus.
Ova are produced by ovaries.
Fallopian tubes (oviducts) carry the ova from the ovaries to the uterus.
Uterus holds the growing embryo/foetus and thus helps in holding the pregnancy.

To know more about the Female Reproductive System, visit here .

Estrogen or oestrogen, is the primary female sex hormone secreted by ovaries.
It is responsible for the development of female reproductive organs, secondary sexual characteristics, development of female gamete, i.e. Ovum and maintenance of menstrual cycle.
The ovary produces the female gametes known as ovum or ova (plural).
In human beings, a single mature egg or ovum is released into the oviduct/fallopian tube by the respective side ovary every month.
The ovum is a single cell and is much larger than the sperm.
It is non-motile and is carried to the uterus by the oviduct.

Fertilization

Fertilization is the process of fusion of the male gamete with the female gamete.

Both the gametes containing haploid (single) sets of chromosomes fuse and thus maintain the diploid (double) number of chromosomes.
The fertilized ovum is now called a zygote.
In human fertilization takes place in the fallopian tube, and then the zygote is carried to the uterus.
Inside the uterus, it undergoes repeated divisions and grows and becomes an embryo.

To know more about Fertilization, visit here .

For more information on Reproduction in Animals, watch the below video

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Frequently Asked Questions on CBSE Class 8 Science Notes Chapter 9: Reproduction in Animals

What is ‘budding’.

A form of asexual reproduction in which a new individual develops from some generative anatomical point of the parent organism.

What is a ‘Hydra’?

Genus of invertebrate freshwater animals of the Class Hydrozoa (phylum Cnidaria) is called a ‘Hydra’.

What is an ‘Embryo’?

An unborn human or animal in the earliest stages of growth when its basic structures are being formed is called an ‘Embryo’.

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Case Study Questions for Class 8 Science Chapter 9 Reproduction in Animals
Here we are providing case study questions for CBSE Class 8 Science Chapter 9 Reproduction in Animals. Case Study Questions. Question 1: Read the passage carefully and answer the questions that follow-. For the continuity of life, all living things produce organisms of their own kind.
Case Study Questions Class 8 Science Reproduction in Animals
Que. 5) Name the two modes of reproduction in animals. Answer Key. Que. 1) (b) Species. Que. 2) (a) Caterpillar. Que. 3) (d) Cow. Que. 4) Answer:In sexual reproduction, the reproductive parts produce gametes that fuse to form a zygote. The zygote develops into a new individual.
Reproduction in Animals Class 8 Case Study Questions Science Chapter 6
Case Study Questions on Reproduction in Animals. Questions. Question 1: Read the given passage below and answer the question: All plants and animals go through life cycles. Just think about all the growing and changing human children do as they grow up.
Important Questions for CBSE Class 8 Science Chapter 9
FAQs on Important Questions for CBSE Class 8 Science Chapter 9 - Reproduction in Animals. 1. Why does the frog lay the egg coverless, whereas Hen lays it with a hard cover according to Chapter 9 Reproduction in Animals of Class 8 Science? In the case of hen, it reproduces through the process of internal fertilisation.
Reproduction in animals
UP Class 8th Science. 17 units · 55 skills. Unit 1. Latest advancements in science and technology. Unit 2. Man made objects. Unit 3. Structure of atom. Unit 4. Minerals and metals. ... Reproduction in animals Get 5 of 7 questions to level up! Genitalia and Embryonic development. Learn. No videos or articles available in this lesson;
NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals
NCERT Solutions for Class 8 Science Chapter 9 - Free PDF Download *According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 5. NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals is a very crucial resource for the CBSE Class 8 students.The NCERT Solutions are provided here to help Class 8 students to get comprehensive knowledge on the main topics ...
NCERT Solutions for Chapter 9 Reproduction in Animals Class 8 Science
Answer. Reproduction is very important for the organisms. The organisms reproduce to produce young ones like them. It helps to carry on their generation. If reproduction does not take place, no living being will survive on the earth. Had the process of reproduction not been there then all the plants and animals would have become extinct.
Reproduction in Animals Class 8 Chapter 9 Science Notes
Reproduction in Animals Class 8 Notes CBSE Science Chapter 9 - Summar of the Notes . Reproduction in Animals is an important chapter and students need to understand its basics well as this knowledge is used as the groundwork for studies in higher classes and when students specialize in the subject of Biology.
Chapter 9 Class 8
Get Notes, NCERT Solutions and Extra Questions of Chapter 9 Class 8 NCERT - Reproduction in Animals. Teachoo provides the best content to learn about Reproduction with NCERT questions, worksheets, extra questions and revision notes. In this chapter, we will learn. What is Reproduction. Different Modes of Reproduction.
NCERT Exemplar Class 8 Science Solutions Chapter 9 Reproduction in Animals
In the list of animals given below, a hen is the odd one out. human being, cow, dog, hen. The reason for this is. (a) it undergoes internal fertilization. (b) it is oviparous. (c) it is viviparous. (d) it undergoes external fertilization. Ans: (b) it is oviparous. Hens reproduce by laying eggs.
CBSE Class 8 Science Chapter 9
The reproduction in animals class 8 notes deals in the sexual reproduction that takes place amongst animals. The ninth chapter of Class 8 science is a great way of making students understands the biological process of reproduction. In addition, it will help you to learn about the various reproductive organs in both females and males.
NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals
NCERT Solutions for Class 8 Science Chapter 9 - 5 Mark Questions and Answers. Question 1. Indicate whether the following statements are True (T) or False (F). [NCERT] Oviparous animals give birth to young ones. ( ) Each sperm is a single cell. ( ) External fertilisation takes place in frog.
Chapter 6: Reproduction in Animals
Question 4. Indicate whether the following statements are True or False. (a) Oviparous animals give birth to young ones. (b) Each sperm is a single cell. (c) External fertilisation takes place in frog. (d) A new human individual develops from a cell called gamete. (e) Egg laid after fertilisation is made up of a single cell.
NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals
Reproduction in Animals Class 8 Science NCERT Solutions. Question 1: Explain the importance of reproduction in organisms. Answer: Reproduction is a biological process through which living organisms produce offspring similar to themselves. Living organisms reproduce to maintain their number and for the continuation of their species.
NCERT Exemplar Class 8 Science Solutions for Chapter 9
The NCERT Exemplar for Class 8 Science Chapter 9 will benefit you immensely, as the solutions help you understand the topics in-depth. Besides, this will aid in learning advanced topics. This exemplar has a variety of questions and answers which you can rely on for your exam preparation. The chapter Reproduction in Animals is about learning the ...
Reproduction in Animals Class 8 Important Questions and Answers
Short Answer Type Questions. 1: Define Sexual reproduction. Answer: Sexual reproduction: Reproduction which begins with the fusion of male and female gamete is called Sexual reproduction. 2: Define Fertilization. Answer: Fertilization: Fusion of egg with sperm is called Fertilization.
Reproduction in Animals Class 8 Science Extra Questions ...
Long Answer Type Questions. Question 1: Describe the process of fertilization in human beings. Answer: The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization.
Reproduction in animals (practice)
Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.
Important Questions Class 8 Science Chapter 9
Answer 1. C) Sperm → oviduct, egg → uterus. Reproduction is a process in which organisms make more organisms similar to themselves. Millions of these sperm are in this small amount of semen, and they swim up from the vagina through the cervix following the uterus to meet the egg present in the fallopian tube.
Notes of Ch 9 Reproduction in Animals| Class 8th Science
Notes of Ch 9 Reproduction in Animals| Class 8th Science. → It consists of testis, sperm duct and penis. → Testes are involved in the production of male gametes called sperms. → Millions of sperms are produced by the testes. → Each sperm consists of three parts: Head, middle piece and tail. → It consists of ovaries, oviduct and uterus.
Reproduction in Animals Class 8 Extra Questions Science Chapter 9
Name two animals in which asexual reproduction takes place. Answer: Hydra and yeast. Question 9. Name the reproductive organs of male. Answer: A pair of testes, two spermducts and a penis. Question 10. Name the reproductive organs of female.
Reproduction in Animals Class 8 Chapter 9 Notes
Fission. It is a type of asexual reproduction in which a single-celled organism divides into two. Division of a nucleus is followed by the division of other cell organelles in the cytoplasm and finally the cytoplasm. Thus, two cells are produced from one parent cell. Example: Amoeba.
NCERT Exemplar Class 8 Science Chapter 9 Reproduction in Animals
Answer. (a) In human beings, sexual reproduction takes place by the combination of gametes, i.e. sperm and egg, formed in male and female, respectively. The fusion of gametes is called fertilisation. The fusion forms a zygote, which divides repeatedly to form the embryo.

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Q7: Which is the largest cell and smallest cell in the human body?

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Reproduction in Animals

Question 3(a)

Question 3(b)

Question 3(c)

Question 10

Reproduction in Animals Class 8 Science Extra Questions and Answers

Class 8 Science Chapter 9 Reproduction in Animals Extra Questions

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Important Questions Class 8 Science Chapter 9

Important Questions Class 8 Science Chapter 9 – Reproduction in Animals

Get Access to CBSE Class 8 Science Important Questions 2022-23 with Chapter-Wise Solutions

Important Questions Class 8 Science Chapter 9 – With Solutions

Benefits of Solving Important Questions Class 8 Science Chapter 9

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Chapter 2 - Microorganisms : Friend and Foe

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Notes of Ch 9 Reproduction in Animals| Class 8th Science

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Reproduction in Animals Class 8 Notes - Chapter 9

Introduction to Reproduction

Sexual reproduction

Cell Division