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A plant receives light from one side, and its stem bends towards that side. What is the most accurate role of auxin?

Answer and explanation

Correct answer: Auxin causes greater growth on the shaded side, bending the stem towards light

This is positive phototropism controlled by unequal auxin distribution. Light from one side causes more auxin to accumulate on the shaded side of the shoot. In a stem, that higher auxin concentration promotes greater cell elongation there. The shaded side therefore grows faster and the stem curves toward the light, making option A correct. The other choices describe biologically unrelated or false effects.

Related tags

AuxinPhototropismPlant HormonesControl And CoordinationScienceClass 10 Mcq

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