Give short answers :
Q. Give short answers :
(i) What is the role of proteins and lipids in the plasma membrane?
(ii) Why plasma membrane is called as selectively permeable ?
(iii) What is the role of cellulose in cell wall?
(iv) What is meant by plasmolysis ?
(v) What is the advantage of flexibility of cell membrane?
(vi) Name the process which is useful for the movement of substances like CO₂ and O₂ across the cell membrane.
Ans.
(i) They provide flexibility to the plasma membrane.
(ii) Because it regulates the flow of selected materials in and out of the cell.
(iii) It provides structural strength to plants. It also helps in the absorption of water thus, preventing desiccation of cell.
(iv) When a living plant cell loses water through osmosis there is shrinkage of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.
(v) It enables the cell to engulf in food and other material from its external environment. This process is known as endocytosis and is useful for amoeba to acquire food.
(vi) Diffusion.
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