Name the following:
$(i)$ The cells which have a changing shape.
$(ii)$ The cells which have a typical shape.

What is a nucleoid?

Give short answers:
$(i)$ What is the role of proteins and lipids in the plasma membrane?
$(ii)$ Why is the plasma membrane called selectively permeable?
$(iii)$ What is the role of cellulose in the cell wall?
$(iv)$ What is meant by plasmolysis?
$(v)$ What is the advantage of the flexibility of the cell membrane?
$(vi)$ Name the process which is useful for the movement of substances like $CO_{2}$ and $O_{2}$ across the cell membrane.

Plasmolysis in a plant cell is defined as

We eat food composed of all the nutrients like carbohydrates,proteins,fats,vitamins,minerals,and water. After digestion,these are absorbed in the form of glucose,amino acids,fatty acids,glycerol,etc. What mechanisms are involved in the absorption of digested food and water?

$A$ cell will swell up if