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What is the main reason for bending of the stem in phototropism?

Answer and explanation

Correct answer: Unequal distribution of auxin

In a shoot receiving light from one side, auxin becomes distributed unevenly, with more auxin generally accumulating on the shaded side. In shoots, this promotes greater cell elongation on that side. The unequal elongation produces curvature, so the stem bends towards the light. Plants have no blood, bones, or muscles; therefore option A is correct.

Related tags

PhototropismAuxinUnequal-GrowthControl And CoordinationWorld Of LivingScienceClass 10 Mcq

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