Phototropism of stem and root are due to

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(A) Phototropism is the growth of a plant part in response to a light stimulus.In stems,light causes the hormone $Auxin$ to redistribute to the shaded

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Differential hormonal effect

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(A) Phototropism is the growth of a plant part in response to a light stimulus.In stems,light causes the hormone $Auxin$ to redistribute to the shaded side,promoting cell elongation and causing the stem to bend towards the light (positive phototropism).In roots,higher concentrations of $Auxin$ inhibit cell elongation,causing the root to grow away from the light (negative phototropism).Therefore,the differential distribution and effect of hormones like $Auxin$ on different sides of the plant organ are responsible for this phenomenon.

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