NCERT Solutions for Class 8 Science Chapter 8

NCERT Solutions for Class 8 Science Chapter 8 Cell-Structure and Functions (अध्याय 8: कोशिका – संरचना एवं प्रकार्य) to Study online or View in Video Format or download free in PDF form free for session 2020-2021.

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NCERT Solutions for Class 8 Science Chapter 8

Class:8
Subject:Science
Chapter 8:Cell-Structure and Functions

Class 8 Science Chapter 8 Answers

NCERT Solutions for Class 8 Science Chapter 8 Cell-Structure and Functions is given below. Video Format solution is also available for this academic session 2020-21. Download 8 Science App in Hindi and English Medium for offline use.

Class 8 Science Chapter 8 Important Questions for Practice

Explain why chloroplasts are found only in plant cells?

Chloroplasts are found in plant cells only because chloroplasts contain chlorophyll which is essential for photosynthesis. Chlorophyll traps cell energy and use it to prepare food for plants.

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

Both, bricks in a building and cells in the living organisms, are basic structural units. All basic functions for the organism survival take place inside cells. As bricks assemble to make a building, cells assemble to make the body of every organism. A group of cells form a tissue which performs a specific function. A group of tissue forms an organ and in the same way a group of organs form an organism. That is why cells are considered as the basic structural units of living organisms.

State the difference between eukaryotes and prokaryotes.

Prokaryotes: The cells having nuclear material without nuclear membrane are termed as prokaryotic cells. The organisms with these kinds of cells are called prokaryotes.
Examples: Bacteria and blue green algae.

Eukaryotes: The cells having a well-organized nucleus with a nuclear membrane are termed as eukaryotic cells. The organisms with these kinds of cells are called eukaryotes.
Examples: Onion cells and cheek cells.

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

Chromosomes are found in the nucleus of the cell. These carry genes and help in inheritance or transfer of characters from the parents to the offspring.

Class 8 Science Chapter 8 MCQ with Answers

1. Choose the correct statement with respect to unicellular organisms:
(a) in unicellular organisms, tissues work in co-ordination to perform different functions.
(b) unicellular organisms do not require food.
(c) unicellular organisms respire and reproduce.
(d) all unicellular organisms move by cilia.
2. Read the different combinations of terms given below:
The correct combination of terms with reference to an animal cell is
(a) cell wall, cell membrane, nucleus, plastid
(b) cell wall, nucleus, ribosome, chromosome
(c) cell membrane, mitochondria, ribosome, chromosome
(d) cell membrane, ribosome, mitochondria, chloroplast.
3. The jelly-like fluid substance present in cells is called
(a) protoplasm
(c) chloroplast
(b) chromosome
(d) cytoplasm
4. Read the following terms and select the pair that is related to
inheritance of characters.
(a) cell wall and cell membrane
(b) chromosome and mitochondria
(c) chloroplast and cell membrane
(d) chromosome and genes
5. Green colour of leaves is due to presence of the pigment_____
(a) chlorophyll
(c) mitochondria
(b) ribosomes
(d) chloroplast
6. The most important function of cell membrane is that it:
(a) controls the entry and exit of materials from cells.
(b) controls only the entry of materials into cells.
(c) controls only the exit of materials from cells.
(d) allows entry and exit of materials without any control.
7. Of the following parts of a cell listed below, name the part that is common to plant cell, animal cell and a bacterial cell.
(a) chloroplast
(c) cell membrane
(b) cell wall
(d) nucleus
8. Identify the statement which is true for cells.
(a) Cells can be easily seen with naked eyes.
(b) Insect’s egg is not a cell.
(c) A single cell can perform all the functions in a unicellular organism.
(d) The size and shape of cells is uniform in multicellular organisms
9. Which of the following feature will help you in distinguishing a plant cell from an animal cell?
(a) cell wall
(c) mitochondria
(b) cell membrane
(d) nucleus
10. Which of the following statements are true for eukaryotic cells?
(i) They do not have a nuclear membrane.
(ii) They have a well organised nucleus.
(iii) They have a nuclear membrane.
(iv) Blue green algae are eukaryotic cells.
(a) ii and iv
(b) ii and iii
(c) i and ii
(d) i and iv

Answers of Important Questions (MCQ)

1 (c)
2 (c)
3 (d)
4 (d)
5 (a)
6 (a)
7 (c)
8 (c)
9 (a)
10 (b).

NCERT Solutions for Class 8 Science Chapter 8 Cell - structure and functions
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