Question

How do auxins promote the growth of a tendril around a support?

Answer 1

Auxin is synthesised at shoot tip  which helps the cell grow longer.When a tendril comes in contact with a support,auxin stimulates faster growth of the cell on the opposite side,so that the tendril forms a coil around the support.This makes the tendril appears as a watch spring.

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Answer 2

Explanation:

Auxin is a plant growth hormone. When the tip of the tendril touches a support, then the auxins present on its tip moves to the side of tip which is away from the support, so, due to more auxins in its tendrils away from the support grows faster.