Question

Assertion (A): Cell membrane is freely permeable.

Reason (R): Cell membrane permits free movement of the solutions across the membrane when two solutions of different tonicity are separated through it.

Options

• A is True and R is False.

• A is False and R is True.

• Both A and R are True.

• Both A and R are False.

Answer 1

A is False and R is True.

Explanation:

A is false. The cell membrane is selectively permeable, meaning it controls how chemicals enter and exit the cell. R is also false. Substances do not move freely across the membrane; instead, mechanisms such as osmosis, diffusion, and active transport control their movement.