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Why is it incomplete to describe phototropism only as bending of a plant?

Answer and explanation

Correct answer: Because it is an auxin based unequal growth response towards light

The governing concept is plant hormonal coordination through a directional growth response. In phototropism, light causes unequal distribution of auxin in the shoot, so cells on the shaded side generally elongate more. This unequal growth produces bending toward the light; bending is therefore the visible result, not the complete mechanism. Option A is correct. The other choices incorrectly invoke muscles, blood flow, or a brain.

Related tags

PhototropismAuxinPlant-HormonesPlant HormonesControl And CoordinationScienceClass 10 Mcq

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