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Why does the stem bend towards light in phototropism?

Answer and explanation

Correct answer: Unequal distribution of auxin causes unequal cell growth

The governing concept is phototropism caused by unequal growth. When light comes from one side, auxin becomes distributed unevenly in the shoot. In a typical shoot, the shaded side receives more auxin and its cells elongate more than cells on the lighted side. This difference in elongation produces curvature, so the stem bends toward the light. Blood, roots pulling light and stopping photosynthesis do not explain it.

Related tags

PhototropismAuxinStem-GrowthControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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