Question

how does the auxin promote phototropism

Answer 1

auxin promote phototropism by bending stem towards sun light

The mechanism is explain in the diagram

Answer 2

Auxin gets degraded in the sunlight and therefore it is prominently found only in the regions that does not receive any much sunlight.  

Explanation:

• The region in the tip is almost depleted of auxin and thereby the auxin diffuses to the shaded regions elongating and growing the cells of that region.  

• This causes the plant to bend towards the tip that is towards the sunlight.  

• Auxin is a hormone that is responsible for cell elongation and cell division.  

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