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I WONDER WHY?

I WONDER WHY?
                              
                           Why does the sunflower always face the sun?
            Sunflowers seem to follow the Sun from morning to evening. All plants show a tendency to orient itself in response to light, which is called phototropism. It is a growth hormone called Auxin that helps the Sunflower to exhibit phototropism. Auxin is sensitive to sunlight, and moves away from it. So Auxin often migrates to the shaded part of the stem. One there, Auxin stimulates the growth of the cells. This cause the stem to become bulkier, and lean in the opposite direction i.e. towards the Sun. As the direction of the shade changes, Auxin also shifts their position in the stem. This keeps the sunflower always facing the sun.


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