Phototropism in shoots is attributed to

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(A) Phototropism is the growth of a plant part in response to a light source. In shoots,this phenomenon is primarily caused by the unequal distributio

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Auxin

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(A) Phototropism is the growth of a plant part in response to a light source. In shoots,this phenomenon is primarily caused by the unequal distribution of the hormone $Auxin$. When a shoot is exposed to light from one side,$Auxin$ migrates to the shaded side of the stem. Since $Auxin$ promotes cell elongation,the cells on the shaded side grow faster than those on the illuminated side,causing the shoot to bend towards the light source.

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