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If unequal distribution of auxin does not occur in a plant, what will happen to phototropism?

Answer and explanation

Correct answer: Bending of the stem towards light may reduce or stop

Phototropism requires unequal growth on the two sides of a young stem. Light causes auxin to become distributed unevenly, and the resulting difference in cell elongation bends the stem towards the light. If auxin distribution remains equal, this differential growth will not develop, so bending may greatly decrease or stop. Therefore option A is correct; the other choices do not follow from auxin action.

Related tags

Control CoordinationAuxin DistributionPhototropismPlant HormonesControl And CoordinationScienceClass 10 Mcq

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