Question

Phototropic and geotropic movements in plants have been traced to be linked with

• A. Enzymes
• B. Starch
• C. Gibberellins
• D. Auxins

Answer 1

Answer: (D)

Auxins

Phototropic movements: Plants grow toward the sunlight to be able to generate energy by photosynthesis. The cells on the plant that are farthest from the light have a chemical called auxin that reacts when phototropism occurs. This causes the plant to have elongated cells on the farthest side from the light.

Geotropism is a movement towards or away from the earth. Geotropism (also known as gravitropism) is a turning or growth movement by a plant or fungus in response to gravity.

Auxins are the phytohormones which are responsible for this kind of movements.