how do hormones promote growth of a tendril around a support
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Auxin increase in concentration in the part of the tendril which is away from the support. This results in increased cell division in that part. The part which is nearer to the support has lesser rate of cell division. As a result, the external part of the tendril grows more than the internal part and the tendril coils around the support.
When the tendril touches a support, auxin moves to the opposite side causing more growth on that side. This makes the tendril twine around the support.
When the tendril touches a support, auxin moves to the opposite side causing more growth on that side. This makes the tendril twine around the support.
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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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