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

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

Welcome to the Chapter 8 - Cell - Structure and Functions, Class 8 Science NCERT Solutions page. Here, we provide detailed question answers for Chapter 8 - Cell - Structure and Functions. The page is designed to help students gain a thorough understanding of the concepts related to natural resources, their classification, and sustainable development.

Our solutions explain each answer in a simple and comprehensive way, making it easier for students to grasp key topics Cell - Structure and Functions and excel in their exams. By going through these Cell - Structure and Functions question answers, you can strengthen your foundation and improve your performance in Class 8 Science. Whether you’re revising or preparing for tests, this chapter-wise guide will serve as an invaluable resource.

Exercise 1

Q 1:

Indicate whether the following statements are True (T) or False (F).
(a) Unicellular organisms have one-celled body. (T/F)
(b) Muscle cells are branched. (T/F)
(c) The basic living unit of an organism is an organ. (T/F)
(d) Amoeba has irregular shape. (T/F)

(a) True

This statement is true because unicellular organism have one cell present in their body, in unicellular organisms, all functions are performed by a single cell.

(b) False

This statement is false because the muscle cells are striated cells. These are not branched.

This statement is false because the basic unit of living organisms is cell. Group of tissues are called as organ.

(d) True

This statement is true because amoeba is irregular in shape. It has pseudopodia. Amoeba is single celled organism.

Q 10:

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.

Down
1. Green plastids.
2. Formed by collection of tissues.
4. It separates the contents of the cell from the surrounding medium.
5. Empty structure in the cytoplasm.
7. A group of cells.

Across:

1. Chlorophyll

3. Organelle

6. Protoplasm

8. Genes

Down:

1. Chloroplast

2. Organ

4. Membrane

5. Vacuole

7. Tissue

Q 2:

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

Nerve cell has dendrite, axon and a nucleus. It has branched cells.

Nerve cells transmit message to the brain and it also receives message from the brain to the receptor organs. It controls and coordinate the working of different parts of the body.

Q 3:

Write short notes on the following:
(a) Cytoplasm
(b) Nucleus of a cell

Cytoplasm: Cytoplasm is a fluid like substance which fills the cell and it is present between the plasma membrane and the nucleus. In cytoplasm, cell organelles like ribosomes, mitochondria and golgi bodies are suspended. Exchange of material between cell organelles is done with the help of cytoplasm.
Nucleus of a cell: The spherical structure is present in the center of the cell called as nucleus. It is composed of the following components:

Nuclear membrane: A double layered membrane which separates the contents of the nucleus from the cytoplasm is known as nuclear membrane. Pores that are present in the nuclear membrane which allows the transfer of specific substance in and out of the nucleus.
Nucleolus: The spherical bodies which are not bounded by a membrane called as nucleolus.
Chromosomes: The thread like structure which carry genes. Genes have the necessary information for the transfer of different characteristics from parents to the offspring. Therefore, inheritance mainly depends on the chromosomes.

Q 4:

Which part of the cell contains organelles?

Cytoplasm is a fluid like substance which fills the cell and it is present between the plasma membrane and the nucleus. In cytoplasm, cell organelles like ribosomes, mitochondria and golgi bodies are suspended. Exchange of material between cell organelles is done with the help of cytoplasm.

Q 5:

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

The difference between plant cell and animal cell are as follows:

Plant cell	Animal cell
These cells are large in size.	Cells are small in size.
Cell wall is present.	Cell wall is absent.
Vacuoles are larger in size.	Vacuoles are small in size.
Plastids are present.	Plastids are absent except Euglena.
Plasma membrane is present.	Plasma membrane is absent.
Mitochondria are present in small number.	Mitochondria are present and are numerous.

Q 6:

State the difference between eukaryotes and prokaryotes.

Differences between eukaryotes and prokaryotes are as follows:

Eukaryotes	Prokaryotes
These are multicellular.	These are unicellular.
Nucleus is well developed and well defined.	Nucleus is poorly defined.
Nucleolus is present in the nucleus.	Nucleoid is present.
Cell organelles are present in this cell like: Ribosomes, Endoplasmic Reticulum, Golgi apparatus etc.	Cells organelles are absent except Ribosomes. Ribosome is the only organelle that is present in both the cells.
Flagella is absent.	Single flagella is present.

Q 7:

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

Chromosomes are found in the nucleus. These are thread like structures. Chromosomes carry genes which are responsible for the transfer of different characters from parents to the offspring. It plays an important role in inheritance.

Q 8:

‘Cells are the basic structural units of living organisms’. Explain.

Various components of plants and animals are made up of cells. The basic and smallest unit of living organism is a cell which is responsible for all the functions. These are also known as the building blocks of the life. Cells are different in shape, size and contains specific functions. That is why cells are known as “the basic structural and functional units of life.

Q 9:

Explain why chloroplasts are found only in plant cells?

Chloroplast only found in the plant cells. The leaves of a plant seems as green due to presence of the pigment chlorophyll. Chloroplast contains the pigment called chlorophyll. Photosynthesis is done by green leaves. The solar energy is trapped by the chlorophyll and utilize in making the food for plants.

Frequently Asked Questions about Cell - Structure and Functions - Class 8 Science

- 1. How many questions are covered in Cell - Structure and Functions solutions?
- All questions from Cell - Structure and Functions are covered with detailed step-by-step solutions including exercise questions, additional questions, and examples.
- 2. Are the solutions for Cell - Structure and Functions helpful for exam preparation?
- Yes, the solutions provide comprehensive explanations that help students understand concepts clearly and prepare effectively for both board and competitive exams.
- 3. Can I find solutions to all exercises in Cell - Structure and Functions?
- Yes, we provide solutions to all exercises, examples, and additional questions from Cell - Structure and Functions with detailed explanations.
- 4. How do these solutions help in understanding Cell - Structure and Functions concepts?
- Our solutions break down complex problems into simple steps, provide clear explanations, and include relevant examples to help students grasp the concepts easily.
- 5. Are there any tips for studying Cell - Structure and Functions effectively?
- Yes, practice regularly, understand the concepts before memorizing, solve additional problems, and refer to our step-by-step solutions for better understanding.

Exam Preparation Tips for Cell - Structure and Functions

The Cell - Structure and Functions is an important chapter of 8 Science. This chapter’s important topics like Cell - Structure and Functions are often featured in board exams. Practicing the question answers from this chapter will help you rank high in your board exams.

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