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If a plant receives light from one side and auxin collects on the shaded side, what will happen?

Answer and explanation

Correct answer: The shaded side will grow more and the stem will bend toward the light

The governing concept is positive phototropism caused by unequal auxin distribution. In a shoot, auxin promotes cell elongation. When light comes from one side, more auxin accumulates on the shaded side, so cells there elongate more than cells on the illuminated side. This unequal growth bends the stem toward the light. Thus A is correct; the other choices do not describe the normal auxin response in a shoot.

Related tags

AuxinPhototropismPlant HormonesControl And CoordinationScienceClass 10 Mcq

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