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How do auxins promotes the growth of a t...

How do auxins promotes the growth of a tendrill around a support ? Describe in brief.

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Auxins produced in the shoot tip move downwrds in the plant. These auxins cause cell elongation in the growing tissues. In the tendrils, auxins move away from the pont of contct with the supporting object. More growth occurs on the side away from the support. As a result of unequal growth on the two sides, the tendril coils around the support.
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