Enumerate functions of plasma membrane.

Functions: (i) Plasma membrane is a selective permeable membrane. Therefore, it allows or permits the entry and exit of some materials in and out of the cell.

(ii) It protects the cell from injury.

(iii) The flexibility of plasma membrane helps the cell to engulf in food and other substances from its external environment. This process is known as endocytosis.

(iv) It bounds the semi-fluid content of the cell.