Auxin synthesis occurs in

Root/shoot tips

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Cortex

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Xylem

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Phloem cells

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Solution

The correct option is A Root/shoot tips
Auxin is a plant hormone. Its synthesis occurs in young meristematic tissues like root and shoot tips. It is synthesized from tryptophan amino acid. It acts as plant growth promoter. It is involved in various physiological processes of plants. It stimulates apical dominance and suppresses the growth of lateral buds. It also plays important role in phototropism.
Thus, the correct answer is option A.

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