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(C) Phototropism is primarily caused by the unequal distribution of auxin in the stem. When a plant is exposed to unilateral light,auxin accumulates o

Vedclass · Accepted Answer

Grow straight upwards

Vedclass · Answer

(C) Phototropism is primarily caused by the unequal distribution of auxin in the stem. When a plant is exposed to unilateral light,auxin accumulates on the shaded side,causing that side to grow faster and resulting in the stem bending towards the light. If the stem is already saturated with auxin,the exogenous auxin overrides the natural gradient,leading to uniform growth on all sides. Consequently,the stem will grow straight upwards despite the unilateral light exposure.

If an etiolated stem is first saturated with auxin by spraying and then exposed to a streak of light from one side,it will:

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