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Why does a plant bend towards light if auxin collects more on the shaded side of the stem?

Answer and explanation

Correct answer: Cells on the shaded side elongate more, making the stem bend towards the light

The governing concept is auxin-controlled phototropism. In a young shoot, auxin collecting on the shaded side promotes greater cell elongation there than on the illuminated side. Because one side becomes longer, the stem curves towards the light, making option A correct. Immediate cell death, pulling by roots and spinal-cord signalling are not explanations for plant phototropic bending.

Related tags

AuxinStem BendingPhototropismPlant HormonesControl And CoordinationScienceClass 10 Mcq

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