why auxin is collected more in shaded region
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Phototropisms are caused by an unequal distribution of auxin. This makes the plant grow either towards or away from the light, depending on which part of the plant receives the light.
In a stem, the cells on the shaded side contain more auxin and grow longer than the cells on the light side. This causes the stem to grow towards the light. It is vital to note that the plant does NOT bend towards the light.
A visual to show four stages of positive geotropism.
In the shoot, auxin moves to the shady side and promotes cell elongation
Auxins have the opposite effect in roots. This is negative phototropism. In a root the shaded side contains more auxin but grows less.
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