Which hormone is responsible for phototropisms?

Ethylene gas

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Abscisic acid

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Auxin

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Gibberellins

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Cytokinins

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Solution

The correct option is C Auxin
Growth curvature response of plants towards light is known as phototropism which is mediated by auxins in plants. Bending of the plant is caused by more elongation of the shaded part as compared to the lighter side, caused by increased auxin concentration on shaded side and decreased on the other side. Thus, the correct answer is option C.

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