Question

Bending of stem towards light is

• A. Photoperiodism
• B. Heliotropism
• C. Photonasty
• D. Hydrotropism

Answer 1

Answer: (B)

Heliotropism

Heliotropism is a growth movement or bending of stem in the direction of the light. It is also called as solar tracking. Photoperiodism is the phenomenon in which various physiological reactions like flowering response to the relative length of dark or light periods. Photonasty is nastic movement of plant towards sunlight. Hydrotropism is a growth movement of plant part in response to water.

Thus, the correct answer is option B.