NCERT Solutions - Cell Structure and Functions of Class 8 Science

VSAT 2022

NCERT Solutions for Class 8 Science Chapter 8 | Free PDF Download

The NCERT Solutions of Chapter 8 cell structure and functions of Class 8 are provided in the article. Chapter 8 of Class 8 deals with the study of the structure and function of cells. It also deals with the study of different cell organelles and a comparison between animal and plant cells. The NCERT Solutions are curated by experts to help students develop a better understanding of the topics and perform well in examinations. The NCERT solutions pdf covers all the important questions of the key topics covered in the chapter.


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Key Topics Covered in Chapter 8 of Class 8 Science

The following are the key topics that are covered in Chapter 8 of Class 8 Science.

  • Discovery of the Cell

  • The Cell

  • Organisms show Variety in Cell Numbers Shape, Size

  • Cell Structure and Function, 

  • Parts of the Cell 

  • Comparison of Plant and Animal Cells.


Key Points at a Glance

The following are some of the key takeaways from the topics covered in this chapter.

  • Cells are defined as the basic structural and functional unit of an organism.

  • According to cell theory, all living organisms are made of cells and all cells come from pre-existing cells.

  • Unicellular and multicellular are two broad classifications of organisms based on the number of cells.

  • Unicellular organism has one cell.

  • Multicellular organism has multiple cells.

  • The two fundamental cell types found in living things are prokaryotic cells and eukaryotic cells.

  • Organelles, the nuclear membrane, the cell membrane, the cytoplasm, the nucleus, and other fundamental sections of the cell are all included in the term "cell composition."

 

Class 8 Science Chapter-wise Marks Weightage

This Class 8 Science Chapter 8 has a weightage of 20 marks and this is one of the most important topics covered in the syllabus of Class 8 Science. The solutions are prepared based on the latest CBSE guidelines and by going through the NCERT Solutions Class 8 Science Chapter 8 students can understand the question pattern of the exam.


Here is more detail about the contents of Chapter 8 Cell Structure and Functions Class 8.


  • 8.1 Explain the nucleus of the cell in detail. (1 long) 

  • 8.2  Difference between prokaryotes and eukaryotes (1 short).

  • 8.3 What is cytoplasm?  (2 short)

  • 8.4  Cells are basic structural units of a living organism (1 short, 1 long)

  • 8.5 Explain why chloroplasts are found only in plant cells. ( 1 short) 

 

Why are NCERT Solutions for Class 8 Science Chapter 4 Important?

  • Our experts have made it as simple as possible for a better understanding of students.

  • Our answers focus on fundamentals to help the students clear the basic concepts.

  • It covers all the important topics of the chapter helping students to score better.

  • It helps to increase self-confidence in students.

  • All solutions are provided by the subject experts which makes learning easy.

  • NCERT solutions consist of all chapter answers and also some interesting activities. 

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Access NCERT Solutions for Class 8 Science Chapter 8 – Cell-Structure and Functions

1) Indicate whether the following statements are true (T) or false (F).

a) Unicellular organisms have one-celled bodies.

Ans. True

 

b) Muscle cells are branched.

Ans. False

 

c) The basic living unit of an organism is an organ.

Ans. False

 

d) Amoeba has irregular shape.

Ans. True


2) Make a sketch of the human nerve cell. What function do nerve cells perform?

Ans. The function of the nerve cell is to receive and transmit messages, helping the brain to regulate and coordinate the activity of various parts of the body.

 

3) Write short notes on the following.

a) Cytoplasm.

Ans. The cytoplasm is a fluid-like substance between the nucleus and the plasma membrane. Various cell organelles such as ribosomes, mitochondria, endoplasmic reticulum, etc. are suspended in the cytoplasm. It helps in the exchange and storage of substances between cell organelles.

 

b) Nucleus of a Cell.

Ans. The nucleus is the cell master, it controls all cell operations. It is usually located in the centre of the cell and has a circular shape. A membrane called the nuclear membrane separates it from the cytoplasm. It also contains DNA and RNA. This perforated membrane allows for the transfer of substances in the nucleus and cytoplasm. The nucleus contains a dense body called Nucleolus that contains chromosomes.

 

4) Which Part of the Cell Contains Organelles?

Ans. Cytoplasm is a fluid-like structure located inside the plasma membrane. It is a large part of the cell, which holds all the organelles of the cell such as the nucleus, mitochondria, Ribosomes, Golgi body, ER and all.

 

5) Make sketches of animal and plant cells. State three differences between them.

Ans. 


Animal Cells

Plant Cells

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Animal cells do not have chloroplasts.

Plant cells have chloroplasts. Chloroplasts enable plants to perform photosynthesis to make food.

They are generally small in

size.

They are usually larger than

animal cells.

Cell wall is absent.

Cell wall is present.

 

6) State the difference between eukaryotes and prokaryotes.

Ans.


Eukaryotes

Prokaryotes

Eukaryotes exist as both unicellular and multicellular organisms.

Prokaryotes are unicellular organisms in nature.

Nucleolus is present here.

Nucleolus is absent here.

Lysosomes and Peroxisomes present in eukaryotes.

Lysosomes and Peroxisomes are absent in prokaryotes.

Ribosomes are larger.

Ribosomes are smaller.

For example: Fungi, plant, and animal cells.

For example: Bacteria and blue-green algae.

 

7) Where are chromosomes found in a cell? State their function.

Ans. Chromosomes are in the form of chromatin found in the nucleus. Chromosome is a gene that stores all kinds of the data which is then passed on from one generation to the next.

 

8) 'Cells are the basic structural units of living organisms.’ Explain.

Ans. Each living thing is made up of cells, plants or animals, bacteria, or any other living thing, all made up of different cell types. Organisms that are as simple as viruses have a single cell type to perform all the functions needed to survive. For complex organisms like human beings, the various types of cells come together and form tissues, organs, organ systems, and living organisms. Each cell type varies in shape, size, and functions.

 

9) Explain why chloroplasts are found only in plant cells?

Ans. Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll essential for photosynthesis. Chlorophyll captures sunlight and uses it to prepare plant food through the process of photosynthesis.

 

10) Complete the crossword with the help of the clues given below.

Across

  • This is necessary for photosynthesis.

  • Term for components present in the cytoplasm.

  • The living substance in the cell.

  • Units of inheritance present on the chromosomes.


Down

  • Green plastids. 

  • Formed by a collection of tissues.

  • It separates the contents of the cell from the surrounding medium.

  • Empty structure in the cytoplasm.

  • A group of cells.

 

(Image will be Uploaded Soon)

 

Ans

  • Chlorophyll

  • Organ

  • Organelle

  • Membrane

  • Vacuole

  • Protoplasm

  • Tissue

  • Genes

 

(Image Will Be Uploaded Soon) 

 

 

By reading this you will get an overall knowledge of the chapter.

 

Chapter Wise NCERT Solutions for Class 8 Science


Along with this, Students can also View Additional Study Materials Provided by Vedantu, for Class 8 :

This was the complete discussion on Cell Structure and Functions NCERT Solutions of Class 8 Science. We highly recommend students download the NCERT solutions pdf and practise each and every question of the pdf. Solving these questions will definitely help students develop a better understanding of the concept thus helping them perform better in the upcoming examinations. 

FAQs on NCERT Solutions - Cell Structure and Functions of Class 8 Science

1. The cell is a simple structural unit of living organisms. Explain.

All plants and animals are made up of cells. It is the smallest unit of life and performs various functions. They are the building blocks of our existence. This is the purpose why cells are referred to as 'the primary structural and functional blocks of existence'. Cells exist in various styles and sizes and perform an extensive variety of activities. Their styles and sizes are associated with the function they perform. They are an important part of living organisms without which life is not possible. Cell carries out various functions such as respiration, transportation, excretion,  reproduction, and many more.

2. Explain the nucleus of the cell in detail.

The nucleus is a double-membrane-bound cellular organelle present in cells. It consists of the DNA, the genetic material. It is the command centre of the cell and is round in shape. It consists of the following components.

  • Nuclear Membrane: It is a double-layered membrane. It separates the contents of the nucleus from the cytoplasm and acts as a wall. It has pores that allow the switch of positive substances inside and outside of the cell.

  • Nucleolus: It has a small dense round body. It is not bounded by a membrane.

  • Chromosome: These are thread-like structures that deliver genes.

3. From where can I get the NCERT Solutions for Science Class 8 Chapter 8?

You can access all NCERT Solutions, including Chapter 8 of Class 8 Science, through Vedantu. NCERT Solutions contains questions and solutions for every NCERT textbook question. The PDF of the NCERT Solutions for Chapter 8 of Class 8 Science is available for download from Vedantu. Experts claim the ideas assist you in better comprehending the Chapter and getting higher grades on your studies. To assist you to ace your test, NCERT Solutions even provides practice questions and exams from prior years.

4. What are prokaryotes? Give some features.

Prokaryotes are creatures with only one cell. They are often of a single cell type. Nucleolar membranes are absent in prokaryotes. As a result, the cell's nucleus is not well delineated. The nucleolus is missing in prokaryotes because the nucleus is improperly characterised. In addition, not all of the cell organelles are present in prokaryotes. Prokaryotes are therefore defined as cells that contain nuclear components but lack a nuclear membrane. Prokaryotes include many organisms including bacteria and blue-green algae.

5. What are Eukaryotes?

Creatures called eukaryotes that have one or more cells. They have well-defined membrane organelle. Eukaryote cells have a nuclear membrane and a well-organised nucleus. Animal cells, plant cells, fungi, cheek cells, onion cells, and more are a few forms of eukaryotic cells.

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