Question

1. Which one of the following is not a function of plasma membrane.
A. Defining shape and size of the cell.
B. Separating the cytoplasm from the external environment.
C. Playing a crucial role in maintaining the balance of substances present in cytoplasm
D. Not controlling the exchange of substances between a cell and its external environment.​

Answer 1

D is answer

Explanation:

Because plasma membrane controlling the exchange of substances between cells in external environment

Answer 2

The correct option is- D. Not controlling the exchange of substances between a cell and its external environment.

Plasma membrane and its functions are described below:

• A plasma membrane is a semi-permeable layer that surrounds the cells of all living organisms. Thus, it provides a definite shape and size to the cell.
• This membrane separates the cytoplasm which is present in the cell from the external environment.
• It is involved in the selective transport of various substances into and out of the cell. Thus, the plasma membrane controls the entry of substances into the cytoplasm. It plays a crucial role in the balance of substances present in the cytoplasm.