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auxins

can someone explain me role of auxins and gibberelins
auxin is growth hormone produced at the tip of the shoot of a plant, at the shoot, it causes cell elongation ( stimulates cell growth) whereas at the toots it inhibits cell growth.
So it light is present , light causes auxin to move to the shaded said of shoot, causing the shaded side to grow more , there for plant grows towards light B(positive phototropic)

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