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When light comes from one side, the stem bends towards it. Why does more growth occur on the shaded side?

Answer and explanation

Correct answer: More auxin may accumulate on the shaded side

In a young shoot, one-sided light causes auxin to redistribute toward the shaded side. In the stem, auxin promotes cell elongation, so cells on the shaded side may elongate more than those on the illuminated side. This unequal growth produces curvature, making the stem bend toward the light. Therefore A is correct. Blood flow and root pulling are irrelevant, and option C does not describe the controlling mechanism.

Related tags

PhototropismAuxinPlant HormonesControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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