how do auxin promote the growth of the tendrils around a support?if you will ans in short I will mark you as brainlist.
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auxin is a plant hormone which is present in the tip of the plant. when a tendril comes on contact with a support auxin plant hormone started stimulates growth on the opposite side.
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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 .
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