Explain the variation of size of cells.


Cells vary in their size. Some cells are very small like bacterial cell whose size is about 0.5 micrometre. Nerve cell is about 1 metre long. Ostrich egg is the largest cell measuring 170 mm ×130 mm. 

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Write the functions of cytoplasm.


Functions of cytoplasm are :

(i) It is a physical basis of all metabolic activities.

(ii) Various cell organelles perform specific functions in the cytoplasm.

(iii) It provides turgidity.

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Write any two functions of protoplasm.


Two functions of protoplasm

(i) It controls all the functions of a cell .

(ii) It is the house for all the cell organelles..

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Write the functions of mitochondria, golgi bodies and ribosomes.


Mitochondria : It performs the function of respiration and provides the cell with energy. It is called the power house of cell.

Golgi bodies : These collect and distribute substances made in cell, synthesis and secretions of many materials.

Ribosomes : They help in the synthesis of proteins.

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Differentiate between prokaryotic cell and eukaryotic cell.


Prokaryotic Cell

Eukaryotic Cell

1. Nucleus is not bound by a nuclear membrane

2. Cell size is generally small (1–10 μm).

1. Nucleus is bound by a nuclear membrane. 

2. Cell is generally large (5–100 μm).

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