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Cell - Structure, and Functions Class 8 Notes CBSE Science Chapter 8 (Free PDF Download)

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Last updated date: 20th Jun 2024
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Cell - Structure, and Functions Chapter 8 Science Notes (CBSE Class 8) - Revision Notes

Cell - Structure, and Functions Chapter 8 Science Notes are provided in this article. If you want to go through a quick revision for the cell structure and function Class 8 Science ch 8 notes are readily available with Vedantu. The cell is the basic structural unit that forms a living organism, no matter if it’s a plant or an animal. In the notes, you will have a basic understanding of cell functioning and composition (made up of). Notes provided by Vedantu are like a shortcut key for you to master your knowledge and present in the exam in a different way. 


Download the free pdf and start your revision effortlessly with us. 


Cell - Structure, and Functions Chapter 8 Science Notes (CBSE Class 8) - Benefits of the Revision Notes 

Let us know the benefits of studying from the revision notes provided by us:

  1. The revision notes will serve as ready-made revision material for the students of CBSE Class 8 Science. 

  2. The revision notes are full-fledged notes which will help the students revise the entire chapter in a capsulated manner. 

  3. The revision notes will help the students to revise in a short span of time before the exam when time is limited while the chapter contents are huge. 

  4. These revision notes are prepared by our expert teachers who have special knowledge in the field of Science, thus after much research, these notes were prepared to make them quite reliable. 

  5. Students can focus on their studies entirely and not waste their time making notes. 


Download CBSE Class 8 Science Revision Notes 2024-25 PDF

Also, check CBSE Class 8 Science revision notes for other chapters:



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Access Class 8 Science Chapter 8 – Cell — Structure and Functions Notes

Cell: 

  • A cell is defined as the basic smallest structural and functional unit of an organism. They are complex units that are microscopic in nature.

  • The term ‘cell’ was first coined by Robert Hooke in the year 1665 when he noticed boxes or compartments in a slice of cork under a microscope.

  • An organism can be made up of a single cell unit and they are called unicellular organisms like an amoeba, paramecium, etc. 

  • The single-cell unit of unicellular organisms performs all the functions necessary for life like growth, digestion, respiration, excretion, and reproduction by itself.

  • An organism made up of many cells is called a multicellular organism like human beings, plants etc.

  • In multicellular organisms, a group of special cells perform the same function and are termed tissues. Similar tissues form an organ and organs form an organism. Thus each cell or group of cells has a specific function to perform.


Flowchart of Organ System

Flowchart of Organ System


  • In general, the cells exhibit a wide variety of shapes, sizes, and numbers and these can vary from organism to organism.

  • A cell can be as big as a hen’s egg which can be seen by the naked eye and as small as 0.1 - 0.5 micrometres in a bacteria. 

  • A cell can be of multiple shapes. It can be spherical like the red blood cells or spindle-shaped like the muscle cells or branched like the nerve cells.

  • The size of a cell is not related to the size of the organism, it is the function of that cell that is important. The nerve cells perform the same function of transferring messages whether it is in an elephant or a rat.


Parts of a Cell:

The cell has basically three main parts, which are the cell membrane, cytoplasm, and nucleus.

  1. Cell membrane: This is the basic component of a cell that encloses the cytoplasm and nucleus and gives shape to the cell. This is also known as the plasma membrane and it separates the cells from each other. It is porous in nature to allow the transport of substances in and out of the cell. The plants have an additional thick outer layer known as the cell wall.

  2. Cytoplasm: The jelly-like substance which is present between the cell membrane and the nucleus is called the cytoplasm. There are various other components of a cell that are present in the cytoplasm called organelles. They are as follows:

  • Mitochondria

  • Endoplasmic reticulum or the ER

  • Ribosomes

  • Lysosomes

  • Vacuole

  • Golgi body

  • Plastids are small coloured bodies in the cytoplasm of plants. The green coloured ones are called chloroplasts.

  • Centrosome which is present only in animal cells.

  1. Nucleus: This is the dense spherical component that is present in the centre of the cell. This is the most important part of a living cell as it controls all the activities of the cell. It also contains thread-like structures called chromosomes which carry the hereditary material in the genes.

  2. Nuclear membrane: The nucleus of a cell is separated from the cytoplasm by a porous membrane called a nuclear membrane which functions to transport substances between the cytoplasm and the nucleus.

  3. Nucleolus: There are small spherical bodies present in the nucleus which are known as nucleolus.


Prokaryotic Cells:

The cells that lack a nuclear membrane for the nucleus are called prokaryotic cells, like bacteria and blue-green algae.


Eukaryotic Cells:

The cells that have a defined nuclear membrane for the nucleus are called eukaryotic cells. All organisms except bacteria and blue-green algae are eukaryotic cells. 


Comparison of Animal and Plant cell:


Plant Cell Diagram

Plant Cell Diagram



Animal Cell Diagram

Animal Cell Diagram

S No

Component

Animal cell

Plant cell

1

Cell membrane

Present

Present

2.

Cell wall

Absent

Present

3.

Cytoplasm

Present

Present

4. 

Nucleus

Present

Present

5.

Nuclear membrane

Present

Present

6. 

Plastids

Absent

Present

7. 

Vacuole

Present

Present


CBSE Class 8 Science Chapter 8 Revision Notes - Summary of the Chapter 

In the class 8th science chapter 8 notes, you will learn the basic functioning of the cell and how they are formed. Some of the basic features are listed below:

  • Living organisms are made of cells, and different body parts are formed through a combination of cells. 

  • Cells form all the parts of plants, including roots, stems, fruit, and leaves, formed with the cell combination. 

  • Similarly, different organs in an animal are formed with cells. 

  • No matter what is the shape of an organism, the basic functioning is of cells.

  • Cells have different shapes and sizes and are different in unique organisms. 

  • The shape of a cell is not fixed in unicellular organisms. One such example is Amoeba. 


How Cell Structure And Function Notes Class 8 Help To Prepare Well?

No doubt, students would have a basic understanding of cells, but the fact is, how will you answer them in the exams? Questions in the exams are not direct and basic. But it is up to your understanding and learning how to formulate and answer it correctly. It is better to answer a question to the point, and these class 8 ch 8 science notes help you prepare well as preferred during examinations.


During exams, it might not be easy to give a thorough reading of the chapter. Hence it would help if you learned the question wisely. 


What Are The Subtopics Covered in Notes of Chapter 8 Class 8 Science?

The cell is the basic unit and is a vast topic to understand how living organisms are formed. There are different functioning, types, and sizes of cells in living organisms. Class eight is an essential phase of life to prepare well and maintain a good base for higher classes. Ch 8 science class 8 notes can help you understand the important topics that you need to study and prepare for your exam. Below are some listed topics that are covered in the notes:

World of Cells: It covers different types of cells with their functioning.

Prokaryotic Cells and Eukaryotic Cells: These are the two basic types of cells present in the living organisms.

Cell Composition: It includes different parts of cells, including cell membrane, cytoplasm, nucleus, nuclear membrane, organelles, and basic other components. 

Plant Cells and Animal Cells: It includes how animal cells are different from plant cells.

Difference Between Plant Cells and Animal Cells: This is also a major concept covered that describes how plant cells and animals differ. 


Cell - Structure, and Functions Class 8 CBSE Science Chapter 8- Topics Covered 

Following are the topics that are covered in this chapter:

  • Discovery of the Cell

  • The Cell

  • Organisms show Variety in Cell Number, Shape, and Size

  • Number of Cells

  • Shape of Cells

  • Size of Cells

  • Cell Structure and Function

  • Parts of the Cell

  • Comparison of Plant and Animal Cells


Cell - Structure, and Functions Class 8 CBSE Science Chapter 7 - Extra Questions to Practice (Solved)

1. Name the basic functional and structural unit of life.

Ans. The cell is known as the basic functional and structural unit of life. 


2. Why type of cell does not have a nucleus within it?

Ans. The RBC or Red Blood Cells do not have a nucleus within them. 


3. Name the parts of the Nucleus.

Ans. The parts of the nucleus are as follows:

The nuclear membrane, Nucleoplasm, and Nucleolus are the three parts of the nucleus. 


How to Study Science in Class 8 CBSE ? - Tips to Study Better 

Following are some suggestions and tips which are required in order to study your Science subject better:

  1. Study the concept well and understand the core of it. 

  2. Revise and take up tests regularly in order to excel in these subjects. 

  3. The concepts which are very important must be practiced by writing them down.

  4. Follow the NCERT Study Material to study the chapters of Science. 


Why are Revision Notes For Class 8 Chapter 8 - Cell Structure and Functions Important?

  • Vedantu’s Revision Notes for Class 8 Chapter 8 - “Cell Structure and Functions” are the finest material to understand and practice the topics in the best way.

  • The material carries all the information in detail and pointwise.

  • All the cases of the material are solved in the simplest way which explains the term clearly.

  • Vedantu Revision Notes for Class 8 Chapter 8 - Cell Structure and Functions provides all the main topics so that the student can focus on it and prepare for the exam. 


Conclusion 

By immersing yourself in the Class 8 Notes Chapter 8 Cell structure and Functions, you not only prepare for your exams more efficiently but also develop a profound understanding of the subject matter. The convenience of downloading these revision notes to your smart devices empowers you to study at your own pace, making learning more flexible and accessible. Vedantu, as a dedicated platform, aims to provide students with free CBSE Solutions (NCERT) and other essential study materials. Thus, the world of knowledge is at your fingertips, with the resources you need to excel in your academic journey.

FAQs on Cell - Structure, and Functions Class 8 Notes CBSE Science Chapter 8 (Free PDF Download)

1. What are the postulates of cell theory?

According to the postulates covered in class 8 chapter 8 notes of cell theory, the cell is the basic functioning unit; the cell is grown from the existing cells, i.e. cells are grown from the division of old cells, all living organisms are made from cells, activity done an organism is all performance of cells. All these are the basic postulates of cells. However, different types of cells are also covered in the notes of CBSE class 8 science notes chapter 8.

2. What is the basic functioning of cells?

The basic functioning in the cell is due to the nucleus present in it. It is like a control centre responsible for the functioning of the body like a company having a boss. Also, a cell is only responsible for division, development, and the growth of the body. Our DNA is located inside the nucleus, which is responsible for the formation of proteins. It is only responsible for producing energy, creating metabolic reactions, and also to perform active and passive transportation. Thus a building block is a cell for a living organism.

3. Where can I download NCERT Solutions based revision notes for Chapter 8 of Class 8 Science?

Vedantu provides you with all revision notes based on NCERT Solutions even for Chapter 8 of Class 8 Science. There are questions and answers for all NCERT textbook questions available in NCERT Solutions. You can download the PDF of NCERT Solutions for Chapter 8 of Class 8 Science for free from Vedantu. The concepts are explained by experts hence helping you understand the Chapter better and assessing you in your school assignments. NCERT Solutions even has practice papers and previous years' papers to help you ace your exam.

4. Write a note of the Nucleus of the cell, according to Chapter 8 of Class 8 Science.

The nucleus is available right in the middle of a cell. It is shaped in a spherical round body. It is one of the most important components of a living cell. The nucleus and cytoplasm are divided by a membrane known as the nuclear membrane. This membrane allows materials to move between the nucleus and the cytoplasm. The nucleus even consists of a nucleolus, which is a spherical-shaped dense mass. Apart from this, the nucleus even contains a thread-like structure known as Chromosomes.

5. What are Prokaryotes, according to Chapter 8 of Class 8 Science?

Prokaryotes are single-celled organisms. They are generally unicellular in nature. Prokaryotes don't have a nuclear membrane. Therefore, the nucleus of the cell is poorly defined. Since the nucleus is not defined properly, the nucleolus in Prokaryotes is absent. Apart from this, Prokaryotes do not have all cell organelles present in them. Therefore, the cells that have nuclear material without having a nuclear membrane are termed Prokaryotes. A few examples of Prokaryotes include Bacteria and Blue-Green algae. 

6. What are Eukaryotes, according to Chapter 8 of Class 8 Science?

Eukaryotes and the opposite of Prokaryotes. Eukaryotes are organisms that have a single or more cell. These help in the formation of Chromosomes. These are generally multicellular in nature. Eukaryotes have a nuclear membrane which in turn helps to define the nucleus well. Eukaryotes are cells that have a well-organized nucleus along with a nuclear membrane. Apart from this, all the cell organelles are present in Eukaryotes. A few examples of Eukaryotes include Animal Cells, Plant Cells, Fungi, Cheek cells, Onion Cells, and more. 

7. How can I make notes for Chapter 8 of Class 8 Science?

Making notes during classes is an important step for you to ace your exams. Writing notes during your classes will help you retain the topics that were taught. You can even refer to the notes provided by Vedantu to help you make notes of your own. To make notes for Chapter 8 of Class 8 Science, you must note down all the important topics and write keywords for each topic. This will help you retain information better. The Revision Notes for Chapter 8 of Class 8 Science are available free of cost on the Vedantu website and the Vedantu app.