The part of the leaf that helps in directing the lamina towards sunlight is

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Stipules

Petiole

leaf base

Stipules and leaf base

answer is B.

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Detailed Solution

Petiole is nothing but stalk of the leaf. It directs the lamina towards sunlight, bears the weight of the lamina, supplies vasculature to lamina and makes the lamina flutter in the air due its flexible nature. Stipules protect the axillary bud and lamina in younger stage of leaf. Leaf base attaches the leaf to the stem at nodal region.

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