Question

Geotropic response of roots is due to:

• A. Inhibition of stem growth.
• B. More growth on lower side.
• C. More growth on upper side.
• D. Uniform growth.

Answer 1

The correct option is B More growth on lower side.

• Auxin is a plant hormone that plays important role in the growth of stem and roots to gravity.
• Geotropism is the plant response to the gravity.
• In stems, auxin accumulates towards the lower side. It results in increase in cell expansion and results in the shoot growing upright.
• Thus, the correct answer is option B.