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(D) : Phototropic curvature is the result of uneven distribution of $auxin$.$Charles \ Darwin$ and his son $Francis \ Darwin$ observed that the coleop

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auxin

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(D) : Phototropic curvature is the result of uneven distribution of $auxin$.$Charles \ Darwin$ and his son $Francis \ Darwin$ observed that the coleoptiles of canary grass responded to unilateral illumination by growing towards the light source $(phototropism)$.After a series of experiments, it was concluded that the tip of the coleoptile contains $auxin$, which causes the bending of the entire coleoptile in relation to the direction of light.

Phototropic curvature is the result of uneven distribution of

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