Question

Assertion (A): Guard cells regulate the opening and closing of the stomatal aperture.

Reason (R): Guard cells contain chloroplasts and are mostly located on the lower surface of the leaves. Other cells of the lower epidermis do not contain chloroplasts.

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

Both A and R are True

Explanation:

Guard cells control stomatal opening and closing as their turgidity changes. They contain chloroplasts, and stomata are generally more numerous on the lower leaf surface; the other lower epidermal cells lack chloroplasts. Therefore, both A and R are true.