grade 8 cells assignment

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Grade 8 Cell Structure and Functions Worksheets

A. State True or False:

1. Unicellular organisms have one-celled body. ……………… 2. Muscle cells are branched. ……………….. 3. The basic living unit of an organism is an organ. ………………. 4. Amoeba has irregular shape. …………………… 5. Most of the cells have nucleus. …………………

B. Answer the following questions in short:

C. Tick (✓) the correct option:

1. The cell wall is made of a non-living material known as: (a) chromosome (b) nucleic acid (c) cellulose (d) protoplasm

2. Food-making structures found in the cells of green plants are called: (a) chloroplasts (b) chromosomes (c) mitochondria (d) chromoplasts

3. Cells which are long and branched are: (a) muscle cells (b) nerve cells (c) red blood cells (d) ostrich egg cells

4. The largest known cell is: (a) ostrich egg (b) RBC (c) WBC (d) skin cell

D. Fill in the blanks:

1. The ……………. is the control centre of the cell. 2. An ……………. is a cell that can be seen without a microscope. 3. Energy is produced in ………………… . 4. Cell wall is found in ………………… cell.

E. Match the following:

F. Compare the plant cell and animal cell, then complete the table:

G. Complete the crossword with the help of clues given below:

Across (→) 1. This is necessary for photosynthesis. 3. Term for component present in the cytoplasm. 6. The living substance in the cell. 8. Units of inheritance present on the chromosomes.

Worksheets for Class 8 Science

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Eighth Grade (Grade 8) Cell Structure and Function Questions

You can create printable tests and worksheets from these Grade 8 Cell Structure and Function questions! Select one or more questions using the checkboxes above each question. Then click the add selected questions to a test button before moving to another page.

• get rid of waste
• provide protein
• store all information
• transport materials
• cell membrane
• mitochondrion
• chloroplast
• central vacuole

• builds proteins
• supports cell shape
• controls cell activities
• releases energy from food
• Chlorophyll
• cytoskeleton
• Golgi apparatus

• cell membrane.
• mitochondria.
• Chloroplasts
• Mitochondria
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Mr. Winkelhage's Website

Grade 7 & 8 science notes and resources.

Living organisms share a number of properties. One of these properties is that they are all made from one or more cells. While some self replicating structures such as viruses and prions push the boundaries of our definition of what life is, in general they are not considered organisms.

Cells are the smallest unit of life, and each cell is a system nested within a system. In Grade 8, students will continue to develop their knowledge of organisms by focusing on the structure and function of cells in plants and animals. Our knowledge of cells has increased enormously since the middle of the twentieth century, and students will examine the implications of this knowledge for individuals, society, and the environment. Students will also be introduced to the use of microscopes. These are invaluable tools for scientists and provide students with opportunities to explore objects in amazing detail. Microscopes are precision instruments and must be handled with great care. It is important that students be able to identify and explain the importance of practices for handling and using microscopes that not only respect the fragility of the tool but also ensure their personal safety and the safety of others.

Cell Theory

With the discovery of the microscope and related technologies, scientists started looking at the microscopic world. What they found was, that far from being lifeless the microscopic world was teeming with minute living things. By examining larger organisms at magnification they found that plants and animals share the same building strategy. In fact, all life shares these microscopic sub-structures we call cells. Some organisms were found to be so small as to consist of only one cell while others are made of more than one cell.

We can distinguish the following terms:

Unicellular:  an organism made from only one cell

Multicellular:  an organism made from more than one cell

Scientists have combined their findings in these three statements, which form what we call  Cell Theory:

• The cell is the basic unit of life. A single cell is the smallest living thing that shows all the characteristics of life.
• Organisms can be a single cell ( unicellular ) or made more than one cell, even trillions of cells ( multicellular ).
• All cells are created from existing cells through the process of  cell division  by which a cell divides into two “daughter” cells.

Parts of a Plant Cell:

Nucleus:  A large organelle that contains the genetic material and controls all functions of the cell.

Endoplasmic Reticulum (ER) : A folded organelle that is responsible for making proteins. We distinguish  smooth  and  rough  Endoplasmic Reticulum. Rough Endoplasmic Reticulum has Ribosomes, smooth does not.

Golgi Apparatus : A folded organelle that collects, combines and distributes proteins inside or outside the cell.

Mitochondria:  A membrane bound organelle that converts food into energy for use in the cell.

Vacuole:  A large sac like organelle that stores excess water, food, waste and other substances, surrounded by a membrane.

Chloroplasts:  Membrane bound organelles that contain chlorophyll. During photosynthesis, the chloroplasts use chlorophyll to convert water, carbon dioxide and light energy to make food (sugar).

Ribosomes : Tiny organelles that help make proteins. Found distributed within the cell and in particular attached to the Endoplasmic Reticulum.

Cytoplasm : A jelly like material that fills the cell.

Cell Wall : A rigid outer wall to provide structure to the plant cell which contains pores to allow the passage of materials.

Cell Membrane : A thin covering between the cytoplasm and the cell wall that controls what passes into or is released from the cell.

Parts of an Animal Cell:

Lysosomes:  Small sac like organelles that contain digestive enzymes designed to break down food and digest waste.

Vacuole:  A sac like organelle that stores excess water, food, waste and other substances which is surrounded by a membrane. Animal cells have several small vacuoles instead of one large one.

Cytoplasm : A watery, jelly like material that fills the cell.

Cell Membrane : A thin covering surrounding the cell that controls what passes into or is released from the cell.

Cellular Transport

Like all living things, cells need to take in food, water and nutrients and eliminate waste. Many specialized cells also release materials for use in the body like for example cells in our pancreas that release insulin. These materials must be transported into and out of the cell and must migrate within the cell.

Diffusion is the simplest form of cellular transport. It is the migration of particles from an area of high concentration of those particles to an area of low concentration. It is driven by the random movement of particles that facilitate the spreading of any free moving particle through Brownian motion. In simpler terms, any collection of particles eventually spreads itself evenly in the available space. The result of this is that if there is a high concentration of particles outside the cell (like oxygen in the blood in your arteries), those particles have a tendency to migrate into the cell by the sheer difference in numbers inside and outside the cell.

The reverse can also be true where an excess of particles is accumulated inside the cell (like carbon dioxide due to the consumption of sugar in the mitochondria) and those particles migrate out of the cell and are carried away by the blood. Diffusion is at work when you smell someone’s perfume or the aroma of a freshly cooked pizza while you pass a restaurant. While diffusion is effective as a means of transportation at the microscopic scale, it quickly becomes ineffective as the size of a cell increases. Hence, organisms needed to develop means of circulating materials through circulatory vessels once they reached a certain size.

Osmosis is a special form of diffusion that occurs across a membrane that allows some materials to pass (primarily water) but not others. Such a membrane is said to be semi-permeable. Since water is the primary substance that can migrate across the membrane, it is the concentration (amount) or water on each side of the membrane that determines in which direction water passes through it. Concentration of water can be changed by the amount of substances that are dissolved in it on each side. If dissolved substances increase on one side of the membrane, the relative amount of water decreases per volume. In such a case, water would tend to flow towards that side of the membrane. If, for example, we increase the salt level in the soil surrounding plant cell roots, water would tend to leave the plant cells and the plant wilts.

In the previous picture we see how osmosis causes water to migrate from left to right to equalize the relative amount of water compared to dissolved sugar. All this only works through a semi-permeable membrane. If the membrane was permeable to sugar, it would be the sugar rather than the water that would appear to migrate and the water levels would remain equal.

Hyper-, Hypo-, and Isotonic Environments:

This is a pretty technical description but the images are good: http://en.wikipedia.org/wiki/Tonicity The difference in effect on animal and plant cells of solutions surrounding the cells depends on the presence or absence of the cell wall. Where a plant cell becomes “turgid” (that means firm) an animal cell may not survive and lyse (means burst, kaPOW, poof). The idea of tonicity has to do with the amount of dissolved substances (in our case salt) surrounding the cell. Hyper= more salt, hypo = less salt, iso = same amount of salt compared to the inside of the cell. The terms hyposmotic, hyperosmotic, etc. correspond to the terms that we have been using (hypotonic, hypertonic etc…)

Transformation of Energy:

Cells use three primary forms of energy transformation:

•  Cellular Respiration
•  Photosynthesis
•  Chemosynthesis

We will discuss the first two:

Cellular Respiration:

Cellular respiration occurs in both plant and animal cells. It is the process by which organisms extract energy from high energy compounds like sugar molecules for use in the organism. Animal cells cannot make these high energy compounds and thus all animals must consume food to survive. Generally, these high energy compounds are converted into carbon dioxide and water and a high energy molecule called ATP ( Adenosine Triphosphate) which the organism uses as its major “energy currency”. ATP is used up during innumerable processes in the organisms metabolism such as transporting materials across the cell membrane, production of proteins and transcription of genetic material.

Photosynthesis:

During photosynthesis light energy is captured and used to convert carbon dioxide and water into sugar, a high energy molecule. Only plants are capable of doing this on our planet and almost all other life depends on this ability to provide these high energy molecules as food. During photosynthesis, photons are captured in the chloroplasts by a compound named chlorophyll. The stored energy is used during a multi-step process that slowly “ratchets” the energy level up to form sugars.

Chemosynthesis:

Chemosynthesis is related to photosynthesis insofar as it also produces organic molecules but instead of using light it uses the chemical power of reactive chemicals such as hydrogen sulfide (H 2 S) or ammonia.

Cell Division:

Cells die at a remarkable rate every day in our bodies. We heal injury, replace dead cells and while we grow, our cells multiply to form the increased size bones muscles etc… of our body. Cells build replacements and increase in numbers by a process called cell division (specifically in this case  mitosis ). The DNA in the nucleus doubles, lines up and then divides evenly into two parts together with the nucleus and the whole cell building two identical “daughter” cells from the parent cell.

http://www.youtube.com/watch?v=s1ylUTbXyWU

http://www.youtube.com/watch?v=aDAw2Zg4IgE&feature=related  (check out the music 🙂 )

(with regard to the videos: disregard the spoken information but instead focus on the visual of the DNA dividing into two equal, identical groups)

Animal and Plant Tissues:

Multi-cellular organisms have developed cells that perform specialized functions such as providing structural support, absorbing materials, production of substances, etc… . Generally, these specialized cells group with one another to form clusters of cells that we call tissues. In humans we distinguish the following major tissue types:

Connective Tissue:

Connective tissue connects and binds other tissues together. Connective tissues are often surrounded by extra cellular material that facilitates this structural function. Bone and blood are unusual forms of connective tissue

Muscle Tissue:

Muscle tissue provides motion to the body through contraction of specialized cells. It is separated into three main types of muscle types: smooth, skeletal, and cardiac muscle.

Nervous Tissue:

Nervous tissue provides control over the entire body. It transmits and receives impulses and processes information. The brain, spinal cord and nerves are made from this type of tissue.

Epithelial Tissue:

Epithelial tissue covers the body inside and out and all of the organs. It provides protection and facilitates the absorption of materials through our skin and in the intestinal tract.

Plant tissues generally fall into three types of categories:

Protective, photosynthetic and transport tissues. Protective tissue covers the outside of the plant and protects from water loss, photosynthetic tissue generates the high energy compounds that the plant uses for food and transport tissues facilitate the distribution of water and nutrients.

Human Organ Systems:

Skeletal System:

The skeletal system is made of bone and cartilage. It’s purpose is to provide structure and protection to the body.

Muscular System:

The muscular system is made of muscles, tendons and ligaments. This system enables you to move and also moves substances through you digestive and circulatory system.

Circulatory System:

The circulatory system consists of the heart, blood vessels and blood. It delivers food and oxygen to our tissues and collects waste products from out cells.

Respiratory System:

The respiratory system consists of the nose, trachea and lungs. It’s purpose is to absorb oxygen from the air and to expel carbon dioxide from the body.

Nervous System:

The nervous system consists of the brain, spinal cord and nerves. It sends, receives and processes signals and controls the rest of the body.

Digestive System:

The digestive system consists of the mouth, salivary glands, esophagus, stomach, liver, gall bladder, pancreas, small and large intestines. It processes food by extracting nutrients and water and expels solid waste.

Excretory System:

The excretory system consists of the kidneys, ureters, bladder, and urethra. It filters our blood and removes excess water and liquid waste.

Integumentary System:

The integumentary system consists of skin, hair, nails and sweat (sebaceous) glands. It covers and protects the body and regulates body temperature.

Endocrine System:

The endocrine system consists of several hormone producing glands like the adrenal glands and portions of the pancreas. Hormones are tremendously powerful chemicals in our bodies that have significant regulative functions for the entire body. Functions such as the regulation of sugar in our blood or activity level and sleep cycles.

Lymphatic System:

The lymphatic system consists of lymph, lymph vessels, nodes and tissues. It is responsible for protection of the body from foreign organisms and abnormal cells.

Reproductive System:

The reproductive system consists of the male and female reproductive organs. It is responsible for the production of offspring.

Animal Cell Specialization Project:

Students research a specialized human cell and prepare a report on their findings for the class. The format of that report is up to the students to develop in conjunction with advice from Mr. Winkelhage. I have copied the handout to a file for you to download if you lost yours or were absent. A rubric is included.

Animal Cell Specialization Report

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Ms. Renee's Classroom

Unit 1: life systems - cells.

Summative Assignment #1 - Model Cell Project ( Student Examples ) Summative Assignment #2 - Processes in the Cell (Student Example - Osmosis/Diffusion ) Summative Assignment #3 - Impact of Cell Biology & Writing Frame 3 - Expository Genre or OWN CHOICE Project (with approval from Mrs. Bader) Project Example

Notes/Handouts:

• Course Outline: Syllabus - Learning Objectives
• Cells Rubrics
• Note 4 - Cells
• Cell Comics
• Care and Use of a Microscope
• Microscope Lab #1
• Dry Mount Slides - Microscope Lab #2
• Wet Mount Slides - Microscope Lab #3
• Note 5 - Single Celled and Multi Celled
• Note 6 - Cellular Transport
• Note 7 - Diffusion and Experiment#4: Diffusion Detective
• Note 8 - Osmosis and Experiment#5: Food For Thought
• Note 9 - Cells and Solutions Experiment#6
• Note 10 - Tissues, Organs, and Systems
• Note 11 - Cell Biology
• Cell Explorer -  Test your knowledge of the cell and its structures, functions and processes.
• Plant and Animal Cells - A closer look at cells—a great diagram.
• The Incredible Mega Cell Comic - An interesting comic based on the cell.

Grade 8: Science: Cells

• Introduction
• Systems in Action
• Water Systems

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• Glossory of the Plant Cell
• Animal Cell
• Glossory of the Animal Cell

The following is a glossary of animal cell terms:

cell membrane  - the thin layer of protein and fat that surrounds the cell. The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others. centrosome  - (also called the "microtubule organizing center") a small body located near the nucleus - it has a dense center and radiating tubules. The centrosomes is where microtubules are made. During cell division (mitosis), the centrosome divides and the two parts move to opposite sides of the dividing cell. The centriole is the dense center of the centrosome. cytoplasm  - the jellylike material outside the cell nucleus in which the organelles are located. Golgi body  - (also called the Golgi apparatus or golgi complex) a flattened, layered, sac-like organelle that looks like a stack of pancakes and is located near the nucleus. It produces the membranes that surround the lysosomes. The Golgi body packages proteins and carbohydrates into membrane-bound vesicles for "export" from the cell. lysosome  - (also called cell vesicles) round organelles surrounded by a membrane and containing digestive enzymes. This is where the digestion of cell nutrients takes place. mitochondrion  - spherical to rod-shaped organelles with a double membrane. The inner membrane is infolded many times, forming a series of projections (called cristae). The mitochondrion converts the energy stored in glucose into ATP (adenosine triphosphate) for the cell. nuclear membrane  - the membrane that surrounds the nucleus. nucleolus  - an organelle within the nucleus - it is where ribosomal RNA is produced. Some cells have more than one nucleolus. nucleus  - spherical body containing many organelles, including the nucleolus. The nucleus controls many of the functions of the cell (by controlling protein synthesis) and contains DNA (in chromosomes). The nucleus is surrounded by the nuclear membrane. ribosome  - small organelles composed of RNA-rich cytoplasmic granules that are sites of protein synthesis. rough endoplasmic reticulum  - (rough ER) a vast system of interconnected, membranous, infolded and convoluted sacks that are located in the cell's cytoplasm (the ER is continuous with the outer nuclear membrane). Rough ER is covered with ribosomes that give it a rough appearance. Rough ER transports materials through the cell and produces proteins in sacks called cisternae (which are sent to the Golgi body, or inserted into the cell membrane). smooth endoplasmic reticulum  - (smooth ER) a vast system of interconnected, membranous, infolded and convoluted tubes that are located in the cell's cytoplasm (the ER is continuous with the outer nuclear membrane). The space within the ER is called the ER lumen. Smooth ER transports materials through the cell. It contains enzymes and produces and digests lipids (fats) and membrane proteins; smooth ER buds off from rough ER, moving the newly-made proteins and lipids to the Golgi body, lysosomes, and membranes. vacuole  - fluid-filled, membrane-surrounded cavities inside a cell. The vacuole fills with food being digested and waste material that is on its way out of the cell.

"Animal Cell Label Me! Glossary - EnchantedLearning.com."  Animal Cell Label Me! Glossary - EnchantedLearning.com . N.p., n.d. Web. 27 Mar. 2015.

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• CBSE Class 8 Science Cell Worksheets

CBSE Class 8 Science Cell Worksheets with Answers - Chapter 8 - PDF

CBSE Class 8 Science Cell- Structure and Functions Worksheets with Answers for Chapter 8 in PDF format to download prepared by expert Science teachers from the latest edition of CBSE(NCERT) books. Register Online for Class 8 Science tuition on Vedantu to score more marks in your examination. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for better solutions can download Class 8 Maths NCERT Solutions to help you to revise the complete syllabus and score more marks in your examinations.

NCERT Textbooks and Worksheets

The CBSE (NCERT) books are acknowledged for designing textbooks at the primary as well as secondary levels. The NCERT textbooks have numerous illustrations that make the textbook very exciting to study. After each concept is introduced, there are solved examples that solidify the concept in a student’s thoughts and upload to their understanding.

NCERT textbooks provide students hundreds of exercises as there's an exercise with distinct forms of questions for each segment in the chapter. These books are designed with the aid of using subject matter experts and are cautiously researched. These books are very easy to follow. Each idea is defined in elements and observed with solved examples and exercises. NCERT textbooks adhere to the CBSE syllabus and are prescribed by CBSE themselves. Likewise, the worksheets by CBSE also adhere to the NCERT books and their chapters. The worksheets are necessary so that students can attain a good grasp of the topic and subtopics of the respective chapters, and can work on the exercise questions easily and without trouble.

If you are looking for downloading the CBSE Class 8 Science cell- structure and functions  Worksheets then go to the official website of Vedantu and then click on the link and then click "Download PDF". You will get all the documents in PDF format.

FAQs on CBSE Class 8 Science Cell Worksheets

1. What is a cell membrane discussed  in the CBSE Class 8 Science chapter 8 Worksheets?

The cell membrane generally describes the outer portion of the part of the outer layer of the cell. The cell membrane or plasma membrane helps in the separation between the cell and its contents from the surroundings. It helps in the protection of the cell and helps in forming the shape. It is semi-permeable and therefore only allows water and the minerals, and some necessary substances to pass through it and have full control on what passes in and out of the cell.

2. Describe cell wall and cytoplasm in the CBSE Class 8 Science cell- structure and functions  Worksheets?

The cell wall in the CBSE Class 8 Science cell- structure and functions  Worksheets is important for the student of Class 8th to understand and for that they need worksheets to score better marks. Vedantu is considered to be the most updated website with relevant information and provides free access to everyone. The cell wall usually presents in the plant cells. It is a kind of additional wall for the proper protection after the cell membrane. This thick layer or wall is made up of cellulose. It helps in giving shape and protection to the plant cell and also leads to providing rigidity to the plant cell in order to withstand the environmental effects.

The cytoplasm is basically described as the jelly sort of substance that helps in forming the inside of the wall. It consists of a nucleus and the presence of various other cell components known as cell organelles.

3. From where I can download the CBSE Class 8 Science cell- structure and functions  Worksheets?

CBSE NCERT books designed the syllabus and the examination patterns so that they can be explained to the student in the simplest possible way. Vedantu has been advised by experts as the website is kept up to date with the latest data as it is managed by highly qualified experts. The experts recommended Vedantu as the best website because it has all the latest information, curriculum, and questionnaires. CBSE Class 8 Science cell- structure and functions  Worksheets have been uploaded to Vedantu  to help in improving the reading and writing skills of students studying in Class 8th. Therefore, a student who reviews Vedantu questionnaires will receive all questionnaires in PDF format. You can download the CBSE class 8 science cell- structure and functions - structure and functions worksheets from the official website of the Vedantu and then click "Download PDF".

4. What are the benefits of CBSE Class 8 Science cell- structure and functions Worksheets?

The benefits of the CBSE Class 8 Science cell- structure and functions Worksheets are mentioned below:

Solutions help the students to fully understand the key ideas with the help of solved questions. 

By referring to the solutions, students learn how to provide staggered answers during the exam to help them score on the exams. 

Solutions are designed in accordance with  CBSE recommendations to help the students prepare for exams accordingly. 

Contains all the necessary questions from the exam's point of view.  

Improves student scores due to its simple explanation and general description of the exam format

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• Cell Structure and Functions...

Cell Structure and Functions worksheet for class 8

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CBSE worksheets for Cell Structure and Functions worksheet for class 8 in PDF for free download. Science worksheets for class 8 CBSE includes worksheets on Cell Structure and Functions as per NCERT syllabus. CBSE class 8 worksheets as PDF for free download Cell Structure and Functions worksheets. Users can download and print the worksheets on class 8 Science Cell Structure and Functions for free.

Download Cell Structure and Functions worksheet for class 8

Cell structure and functions worksheet for class 8 important topics.

• Discovery of the Cell
• Organisms show Variety in Cell Number, Shape and Size

Cell Structure and Function

• Parts of the Cell
• Comparison of Plant and Animal Cells

Some important Facts about Cell Structure and Functions worksheet for class 8

• Visit a laboratory for senior secondary students in your school or in a neighbouring school. Learn about the functioning of a microscope in the laboratory. Also observe how a slide is observed under the microscope.
• Talk to the senior biology teacher in your school or a neighbouring school. Find out if there are diseases which are passed on from parents to the offspring. Find out how these are carried and also if these diseases can be treated. For this you can also visit a doctor.
• Visit an agriculture extension centre in your area. Find out about genetically modified (GM) crops. Prepare a short speech for your class on this topic.
• Find out about Bt cotton from an agriculture expert. Prepare a short note on its advantages/disadvantages.

NCERT Class 8 Science Solved Worksheets

• 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

CBSE Worksheets for Class 8 Science in PDF

• CBSE 8 Science Chapter 01 Crop Production and Management
• CBSE 8 Science Chapter 02 Microorganisms Friend And Foe
• CBSE 8 Science Chapter 03 Synthetic Fibres and Plastics
• CBSE 8 Science Chapter 04 Materials Metals and Non Metals
• CBSE 8 Science Chapter 05 Coal and Petroleum
• CBSE 8 Science Chapter 06 Combustion and Flame
• CBSE 8 Science Chapter 07 Conservation of Plants and Animals
• CBSE 8 Science Chapter 08 Cell Structure and Functions
• CBSE 8 Science Chapter 09 Reproduction in Animals
• CBSE 8 Science Chapter 10 Reaching the Age of Adolescence
• CBSE 8 Science Chapter 11 Force and Pressure
• CBSE 8 Science Chapter 12 Friction
• CBSE 8 Science Chapter 13 Sound
• CBSE 8 Science Chapter 14 Chemical Effects of Electric Current
• CBSE 8 Science Chapter 15 Some Natural Phenomena
• CBSE 8 Science Chapter 16 Light
• CBSE 8 Science Chapter 17 Stars and the Solar System
• CBSE 8 Science Chapter 18 Pollution of Air and Water

You have learnt that each living organism has many organs. You have studied in Class VII about the digestive organs which together constitute the digestive system. Each organ in the system performs different functions such as digestion, assimilation and absorption. Similarly, different organs of a plant perform specific/specialised functions. For example, roots help in the absorption of water and minerals. Leaves, as you have learnt in Class VII, are responsible for synthesis of food. Each organ is further made up of smaller parts called tissues. A tissue is a group of similar cells performing a specific function.

Paheli realised that an organ is made up of tissues which in turn, are made up of cells. The cell in a living organism is the basic structural unit.

To download Printable worksheets for class 8 Mathematics and Science; do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through  the best app for CBSE students  and myCBSEguide website.

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8.27: Assignment- Mitosis and Meiosis Worksheets

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Use the two documents linked below to complete an internet hands-on activity involving mitosis and meiosis. During these activities you will demonstrate your understanding of cell division by identifying and drawing various stages of these events as well as answering questions about each.

Download Worksheets

You may chose to print these sheets, write your answers out and then rescan the documents to create your single submission file. Or you may chose to type your answers into the Word document and submit that file. Do keep in mind that you must complete the drawing activities as well so in some fashion you have to get those images into your final file.

See this example for one way you may insert your images.

Basic Requirements (the assignment will not be accepted or assessed unless the follow criteria have been met):

• Assignment has been proofread and does not contain any major spelling or grammatical errors
• Assignment includes appropriate references
• Assignment includes answers to all questions and required images

Contributors and Attributions

• Authored by : Shelli Carter. Provided by : Columbia Basin College. Located at : https://www.columbiabasin.edu/ . License : CC BY: Attribution
• Mitosis--Internet Lesson. Provided by : Biologycorner. Located at : https://www.biologycorner.com/worksheets/mitosis.html . License : CC BY-NC: Attribution-NonCommercial
• Meiosis--Internet Lesson. Provided by : Biologycorner. Located at : https://www.biologycorner.com//worksheets/meiosis_internet.html . License : CC BY-NC: Attribution-NonCommercial

18 Fun Cell Activities for Middle School

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One of the great things about homeschooling is that we can present material in a variety of ways until we find something that ‘clicks’. Learning the roles of various organelles is a standard part of most middle school and high school biology courses, but it can be a little confusing. There is a lot to remember! These fun cell activities can help.

These cell activities can be mixed and matched in whatever way works best for your family. Use as many as necessary to get the job done. Many of these activities are fun (and some are even tasty), so I don’t think your teens will mind the work.

Fun Cell Activities for Middle School

Edible cell activities.

My kids always seem to pay a little more attention if there is food involved in their lessons. Thankfully, it is pretty easy to create incredible edible cell models.

The concept is pretty much the same no matter which food you use. You need something to act as the base of the model and then various foods to represent each organelle. Be sure to only use edible materials.

Cell Cake – Years ago my kids created a cell cake to help them memorize the various cell organelles. They used a variety of candies to replicate the organelles. It was a fun and tasty way to learn about cells. I made the cake from scratch, but picking up a plain cake from a grocery store would work just as well.

Pizza Cell -To make an edible cell from pizza, use the crust as the project base. Then choose a different topping to represent each cell part. One pizza represents a single cell.

Jello Cell – Making a jello cell model works exactly the same as a cell cake. It just uses jello as the base. Chill the jello in a mixing bowl or a pie plate so there is room for the organelle toppings. Jello cells require a bit of refrigeration, time, and patience to get everything in the right place.

Printable Cell Worksheets

These worksheets review cell structure. The basic structures include:

• Cell membrane
• Golgi apparatus
• Smooth endoplasmic reticulum
• Cytoplasm of a cell

Label the animal cell parts – Here are several free worksheet variations on coloring and labeling animal cell parts. There is an answer key included.

Label the plant cell parts – These plant cell parts worksheets are from the same site as the above animal cell organelle worksheets. I love that they are free and easy to print!

Cut and Paste Cells – This free cell worksheet set includes options for plant and animal cells. Students cut out the organelle names and glue the labels in the correct part of the cell.

Cell Match Coloring Page – This free cell worksheet, on Teachers Pay Teachers, asks students to color organelles certain colors. This makes it quick and easy for the parent or teacher to check and make sure it is correct.

Human Cells Printable Pack – This free worksheet pack will help kids learn about the types of different human cells and their functions.

Need more cell worksheets? Check out this awesome collection of plant and animal cell worksheets!

Venn Diagram

Venn diagrams are a great way to help students visualize the connections between two things, in this case, plant and animal cells. To make this graphic organizer, just draw two overlapping circles on a sheet of paper. Make sure to make the circles large enough to have room to write.

Model of a Cell

Shrinky Dink Cell Model – Shrinky dink cell models are a fun way to get crafty or artistic kids interested in learning the parts of a cell. Shrinky dink material, available online or in craft stores, starts off large, but shrinks and thickens in a warm oven. Watching the transformation is part of the fun!

Play Dough Cell Models – Play dough cell models are easy to make. All you need is an assortment of play dough colors. Ideally, you will be able to use one color for each organelle. Then students just form organelles and place them in the correct spot. This is a great option if you have a tactile learner!

Styrofoam – Styrofoam cell models feel very ‘old school’, but they still work. Let’s think of it as a classic hands-on biology activity. Students use different shapes as the base of the model. They are able to cut into it and show the cell in its entirety. Some styrofoam shapes are pretty large, giving student’s a chance to create a giant cell.

Online Cell Activities

Plant Cell Game – This free online cell game asks players to correctly drag the organelle name to the image. If they are correct, the organelle lights up. If they are incorrect, the label returns to the list and they can try again. They can try as many times as necessary until they get all of the labels in the correct spot. This is a great way to test a student’s knowledge of cells.

Legends of Learning Games – Legends of Learning requires an account, but accounts are free. It is very convenient to have a few cell activities all on one site!

These cell games include:

• Mrs. Daisy’s Lessons
• Cell Attack
• Animals and Plants
• Plants vs Animals
• Cellular Adventure

Cell Defense – Students will learn all about the defense mechanisms of cells with these games. They can:

• Build a Membrane
• Complete a Membrane Structure Challenge
• Reach equilibrium with the Diffusion Challenge
• Try the Energy and Transport Challenge

Online Jigsaw Puzzles – Students can drag and drop jigsaw puzzle pieces into the correct spot to create animal and plant cells. There is also an organelle memory matching game available.

Virtual Tours of Cells

Through the Virtual Cell – These animated slides take viewers on a virtual tour of a cell. This can be a great way to really understand how the cell structures fit together.

3D Tour of the Cell – This video guides viewers through two cell types, eukaryotic cells and prokaryotic cells, relatively quickly. Students will learn quite a bit in just 7 minutes!

I hope these cell activities are helpful and you add them to your lesson plan!

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Welcome! My name is Jennifer. I am a teacher at heart. Before my children were born I was a public school teacher. Now, I am a homeschooling mom of two.

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Resources: Course Assignments

Module 8 assignment: mitosis and meiosis worksheets.

Use the two documents linked below to complete an internet hands-on activity involving mitosis and meiosis. During these activities you will demonstrate your understanding of cell division by identifying and drawing various stages of these events as well as answering questions about each.

Download Worksheets

You may chose to print these sheets, write your answers out and then rescan the documents to create your single submission file. Or you may chose to type your answers into the Word document and submit that file. Do keep in mind that you must complete the drawing activities as well so in some fashion you have to get those images into your final file.

See this example for one way you may insert your images.

Basic Requirements (the assignment will not be accepted or assessed unless the follow criteria have been met):

• Assignment has been proofread and does not contain any major spelling or grammatical errors
• Assignment includes appropriate references
• Assignment includes answers to all questions and required images
• Authored by : Shelli Carter. Provided by : Columbia Basin College. Located at : https://www.columbiabasin.edu/ . License : CC BY: Attribution
• Mitosis--Internet Lesson. Provided by : Biologycorner. Located at : https://www.biologycorner.com/worksheets/mitosis.html . License : CC BY-NC: Attribution-NonCommercial
• Meiosis--Internet Lesson. Provided by : Biologycorner. Located at : https://www.biologycorner.com//worksheets/meiosis_internet.html . License : CC BY-NC: Attribution-NonCommercial

• CBSE Notes For Class 8
• Class 8 Science Notes
• Chapter 8: Cell Structure And Functions

Cell - Structure and Function Class 8 Notes

According to the CBSE Syllabus 2023-24, this chapter has been removed from  NCERT Class 8 Science textbook .

Early Days of Cells

Cells are the fundamental structural units of living organisms and the basic units of life.

For more information on Cell Structure and Its Function, watch the below video

World of Cells

Prokaryotic & eukaryotic cells.

Prokaryotic – Size: generally small ( 1-10 µm), Where 1 µm = 10 − 6 m.

• The nucleus is not well defined and known as a nucleoid.
• Single, circular chromosome.
• Membrane-bound organelles are absent. For example, Bacterial cell

Eukaryotic – Size: generally large ( 5-100 µm).

• The nucleus is well-defined and surrounded by a nuclear membrane.
• Possess more than one linear chromosome.
• Membrane-bound cell organelles are present. For example, Human cells.

Cell structure in Eukaryotic cells

• Most eukaryotes are multicellular.
• The nucleolus is present in the nucleus.
• It contains cell organelles such as plastids, mitochondria, Golgi bodies, etc.
• Fungi, plant, and animal cells are eukaryotic.

Cell membrane

• The cell membrane separates cells from one another and also the internal contents from the surrounding medium.
• It is porous and allows the movement of substances or materials both inward and outward.
• It is the jelly-like substance present between the cell membrane and the nucleus.
• Various other components, or organelles of cells, are present in the cytoplasm.

Cell walls in plants

• A cell wall is an additional covering over the cell membrane in plant cells.
• It gives shape and rigidity to these cells.
• It gives a rigid structure to plant cells, and that is why they can withstand the stress of high-velocity wind, rain, high temperature etc.

Cell Factory

• The various components present within the cell are known as cell organelles.
• All these components are special and specific to their functions.
• For example, mitochondria, lysosomes etc.
• It is generally spherical and located in the centre of the cell.
• The nucleus is separated from the cytoplasm by a membrane called the nuclear membrane .
• It uses information in the chromosomes to decide what each organelle should do and the functions of the cell.
• The nucleus contains an even smaller concentrated material called  nucleolus .

Chromosomes

• The nucleus contains thread-like structures called chromosomes.
• These carry genes and help in the inheritance or transfer of characters from the parents to the offspring.
• Chromosomes are composed of DNA in the form of Chromatin and protein.
• Chromosomes contain information for the inheritance of features from parents to next generation in the form of DNA molecules.
• DNA molecules contain the information necessary for constructing and organising cells.

Functional segments of DNA are called genes.

Vacuoles, Endoplasmic Reticulum and Golgi Apparatus

• Vacuoles are storage bubbles of irregular shapes which are found in cells.
• The vacuole stores the food, a variety of nutrients that a cell might need to survive or waste.
• In plant cells, vacuoles are much larger than in animal cells, and they provide rigidity to the plant cells.

Golgi Apparatus

• Golgi Apparatus, also termed as Golgi Complex, is a membrane-bound nucleus.
• Its main function is to modify proteins.
• These modified proteins are placed in Golgi so that they can transport elsewhere in the cell when required.

Endoplasmic Reticulum

• It is a membranous organelle.
• It is found in all eukaryotic cells.
• The ER is divided into two types based on their physical and functional properties viz. Smooth and Rough ER.

• It synthesizes and secretes proteins in the cells.
• The SER is involved in the synthesis of phospholipids, the main lipids in cell membranes and are very important in the process of metabolism.
• They also transport the products of the rough endoplasmic reticulum to other cell parts like the Golgi apparatus.
• Lysosomes are small membrane-bound sac-like structures which release digestive enzymes that break down food.
• They also remove the old and damaged or dead organelles from the cell and, thus protect the cell from further damage.

Mitochondria

• Mitochondria is a double membrane-bound sausage-shaped organelle.
• Also known as ‘ powerhouse of the cell ’.
• Mitochondria are the sites of aerobic respiration in the cell, and it produces energy in the form of ATP.

For more information on Mitochondria, watch the below video

• Plant cells have tiny, coloured structures called plastids.
• Plastids carry pigments of various colours like orange, red, green and even colourless.
• The plastids, which carry green-coloured pigments, i.e., chlorophyll are called chloroplasts.

For more information on Plastid and Its Functions, watch the below video

Plants vs Animals

Comparison of plant and animals cells

Learn more about the cell and its various parts and other related topics, including NCERT class 8 Science notes , at BYJU’S.

Also Read:-

Frequently Asked Questions on CBSE Class 8 Science Notes Chapter 8 Cell Structure and Function

What is a cell.

A cell is a basic unit of life, and it mainly comprises the nucleus, cytoplasm and cell membrane. There are several other organelles inside the cell.

What are the other important organelles of the cell?

The important organelles of the cell are Ribosomes, Endoplasmic reticulum, Golgi apparatus, Choloplasts, and Mitochondria.

What is the study/research of cells called?

The study of cells or cell biology is called Cytology.

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Alberta Grade 8 Science - Cells and Systems

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Alberta Science Curriculum - Grade 8 – Unit B: Cells and Systems . This product was created to cover the Alberta Science Grade 8 curriculum – Cells and Systems.

There are 202 activity sheets that cover the outcomes in the science curriculum. This massive unit contains readings, research assignments, diagrams, true/false, and much more!

We have incorporated science, technology and society (STS) and knowledge in this resource. We have also made connections to math and engineering in a STEM approach.

Check out the preview of this unit to learn more about how it can benefit your students.

Some of the concepts that are covered:

• What is a cell?
• Cell theory
• Organelles in cells – nucleus, cell membrane, cytoplasm, cell wall, mitochondria and more
• Research assignment – organelle in plant and animal cells
• Diagrams of plant and animal cells
• Comparing plant and animal cells – structure, organelles, size, shape
• Identifying plant and animal cells
• Experiment/activity – building a 3D model of a cell
• Diffusion of molecules in cells
• Osmosis in cells
• Factors affecting diffusion
• Diffusion and the exchange of gas in humans and frogs
• Ideal solutions for cells – osmosis
• Unicellular organisms – Amoeba and Paramecium
• Research assignment – studying unicellular organisms
• Multicellular organisms – humans, worms, and frogs
• Levels of organization – cells, tissues, organs, and organ systems
• Researching organ systems to learn about the organs, tissues, and cells included
• Nervous system – diagrams, reading and questions
• Circulatory system – diagrams, reading and questions
• Circulatory system experiment – testing heart rate and exercise
• Respiratory system – diagrams, reading, questions, and building a respiratory system model
• Digestive system – diagrams, reading, questions, and creating a model digestive system
• Skeletal system - diagrams, reading and questions
• Muscular system - diagrams, reading and questions
• Integumentary system – reading, diagram, and questions
• Immune system – reading, diagram, and questions
• Excretory system – reading, diagram, and questions
• Diseases – Stroke, Asthma, Celiac, and Epilepsy – Readings and questions for all four
• Stem cell technologies treating disease – Alzheimer's and Spinal injuries
• Researching advantages and disadvantages of stem cells
• Cellular agriculture – cultured meat
• Using cultured meats – multiple perspectives (animals, environmentalists, livestock farmers)
• Answer pages for all activities

This is a comprehensive unit that will save you hours of planning! It has been tested and found effective in helping students achieve the learning outcomes in the science curriculum.

Follow  Super Simple Sheets  for more resources like this one!

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