How does auxin responsible for bending of stem towards sunlight?
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Auxin is plant growth regulator which is sensitive to light. ... Auxinstimulates the growth of cells on the shady side of the plant which causesbending of the plant to the other side. This gives the appearance that the stem of the plant bends in the direction of light.
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Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant. This produces a curving of the plant stem tip toward the light, a plant movement known as phototropism.
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