Question

Which plant hormone induces the phenomenon of phototropism in plants?

• A. Auxins
• B. Ethylene
• C. Cytokinin
• D. Gibberellin

Answer 1

The correct option is A Auxins

Auxins induce phototropism in plants, that growth of a plant part towards light (shoot) or away from light (root).

Auxins bring about elongation and growth of the shoot towards light, being sensitive to light accumulate in the region opposite to the direction in which growth has to take place, here it brings about elongation of the cells and growth of the shoot in the direction of light.

So, the correct answer is 'Auxins'