Question

name the harmone synthesised at the shoot tips. how does it help the plant to response to light?

Answer 1

Auxin is synthesized at the top of the shoots.
This hormone has a tendency to go away from light thus in a plant it gets deposited to the non-photo side.
And thuz this hormone overgrows the non-photo side and the plant gets bent due to improper weight and thus positive phototropism is observed.

Answer 2

Answer:

The plant hormone which is synthesized at the shoot tips is auxins. When growing plants detect light, hormone auxin, synthesized at the shoot tip, helps the cells to grow longer. When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot.This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards light.