How do auxin promote in growth of tendrils
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auxin is plant harmone which found in the tip of shoot it help in the elongation of cell . when tendrils comes in support then auxin active and elongation of cell opposite side that's why the tendrils make a coil like structure
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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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