Question

How do oxgin promote the grwth of tendrile arround a support?

Answer 1

it is not oxgin which promote the growth of tendrile around a support

it is the hormone called "auxin" present in plants which helps in the growth of tendrile around the support

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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 .