Amoeba acquires its food through a process,termed

Name the stain used to prepare slides like that of onion peel and cheek cell. Why is the use of stain necessary? Do all organelles absorb stain equally?

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.

The cell wall of which of these is not made up of cellulose?

$(a)$ Write two points of difference between the nuclear region of a bacterial cell and the nuclear region of an animal cell.
$(b)$ Which structure present in the nuclear region of a living cell bears genes?

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?