Growth substance that stimulates nodule formation in leguminous plants is

NAA

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IAA

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IBA

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ABA

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Solution

The correct option is B IAA
Indoleacetic acid (IAA) is a type of auxin, plant hormone. It shows various effects on development of plants. It stimulates cell elongation and cell division. It also induces nodule formation in leguminous plants.
Thus, the correct answer is option B.

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