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(C) Phototropic and geotropic movements in plants are primarily regulated by the hormone $Auxin$.$Auxin$ is synthesized at the shoot and root tips and

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Auxin

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(C) Phototropic and geotropic movements in plants are primarily regulated by the hormone $Auxin$.$Auxin$ is synthesized at the shoot and root tips and is transported to the site of action.In response to light (phototropism),$Auxin$ accumulates on the shaded side of the stem,causing cells to elongate more on that side,which results in the bending of the stem towards the light.Similarly,in response to gravity (geotropism),$Auxin$ distribution influences the differential growth of roots and shoots,directing the growth of the plant.

Phototropic and geotropic movements are linked to

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