Question

Assertion (A): Transpiration is a biological activity.

Reason (R): Transpiration occurs through living tissues of aerial parts of plants.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true and R is the correct explanation of A.

Explanation:

The assertion is true because transpiration is a regulated physiological biological activity actively controlled by the plant's living guard cells and stomatal movements. The reason is also true and provides the correct explanation because this biological control is necessary precisely because the water vapour escapes directly through the living tissues of the plant's aerial organs (like the epidermis of leaves). This structural and biological involvement separates it entirely from simple, non-biological physical evaporation.