how do auxins promote the growth of a tendril around a support
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Auxins diffuses more on the site not in touch with support and less on the site in touch with the support. This causes the more growth in site not in touch with the support and the tendril to curl around the support.
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Explanation:
Auxin is a plant growth hormone. When the tip of the tendril touches a support, then the auxins present on its tip moves to the side of tip which is away from the support, so, due to more auxins in its tendrils away from the support grows faster.
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