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Why is phototropism in plants called a growth based response?

Answer and explanation

Correct answer: Because bending occurs due to greater growth of cells on one side of stem

Phototropism is a directional growth response to light. In a shoot receiving light from one side, auxin is redistributed and usually promotes greater cell elongation on the shaded side. That side grows faster, so the shoot bends toward the light. The plant does not move by muscles or run, and leaves do not pump blood. Thus option A correctly identifies unequal growth as the cause.

Related tags

PhototropismGrowth-ResponseAuxinPlant HormonesControl And CoordinationScienceClass 10 Mcq

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