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Why does the stem bend towards light in phototropism?

Answer and explanation

Correct answer: More growth occurs on the shaded side

Phototropism is a growth response controlled by unequal distribution of auxin. When light comes from one side, more auxin collects on the shaded side of a shoot. Cells there elongate more than cells on the illuminated side, so the stem curves toward the light. Thus option A is correct. The other choices describe neither the cause of bending nor the actual response of a shoot.

Related tags

PhototropismAuxinPlant CoordinationControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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