How do auxins promote growth of a plant
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When growing plants detect light , a hormone called auxin, synthesized at the shoot tip,helps the cells to grow longer when light is coming from one side of the plant ,auxin diffuses towards the shady side of the shoot . this concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light .Thus the plant appears to bend towards light
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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 form the support, auxins promote growth. So, due to more auxins in it, the side of tendril, away from the support, grow faster and becomes longer than the side which is in contact with the support and makes the tendril curve towards the support.
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