Question

how does auxin promote the growth of tendril around a support easy answer don't copy

Answer 1

Auxin stimulates along the shady side and causes growth of shady side while the front side experiences less growth so tendril coils around the support due to the push of shady side

Answer 2

When the tip of a tendril touches a support , then the auxins present in its tip move to that side of tip which is away from the support . Auxins promote growth . So due to more auxins in it , the side of tendril away from the support grows faster than the side which is in contact with the support and makes the tendril twirl around the support .