Question

auxins promote the growth of a tendril around a support how?

Answer 1

yes Auxins help in growth of root and shoot tips .... because in a tendril the non illuminated part receives the auxin transferred from shiny surface ...... and thus the tendrils start curling out .

Answer 2

Auxin is plant hormone which is synthesized at the tip of the shoot. It helps the cell grow longer. When a tendril comes in contact with a support, auxin stimulates faster growth of the cells on the opposite side that's why the tendril forms a coil around the support.