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NCERT Solutions for Class 8th Science

 

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Chapter 8. Cell - Structure and functions

Additional Questions With Solutions

 

 

 

Additional Question With Solutions


Ques: What are chromosomes?

Ans: The nucleus contains thread-like structures called chromosomes.

Ques:What are genes?

Ans: Genes control the transfer of hereditary characteristic from parent to offspring; it is carried by the chromosomes.

Ques:What is protoplasm?

Ans: The all entire contents of a living cell is known as protoplasm.

Ques:When can the chromosomes be seen?

Ans: Chromosomes can be seen only when the cell divides.

Ques:Which component of a cell is called the living substances of the cell?

Ans:Protoplasm.

Ques:What is chloroplast? Write its functions.

Ans: Green colour plastid is called chloroplast.

     Functions of chloroplast:

 (i)  It provides green colour to the leaves.

 (ii) It is essential for photosynthesis.

Ques:Name the components or organelles of cytoplasm in an animal cell.

Ans: The components or organelles of cytoplasm in an animal cell.

(i) Mitochondria

(ii) Golgi body

(iii) Vacuole

(iv) Ribosome

(v)Lisosome

Ques: Explain why chloroplasts are found only in plant cell?

Ans: The plants make their food themselves by the process of photosynthesis. Photosynthesis needs chlorophyll, which is called chloroplast. It also provides the green pigment to the plants’ leaves. So it is very important for the plants.

Ques:Cells are the basic structural units of living organism; explain.

Ans: Bricks are assembled to make a building. Similarly, cells are assembled to make the body of every organism. The brick is unit part of the building. Thus, cells make tissue; tissues make organs; and various organs make together the body. So we can say cells are the basic structural units of living organism

 

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