Growth substance that simulates nodule formation in leguminous plants is

ABA

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NAA

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IAA

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IBA

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Solution

The correct option is C IAA
Effect of IAA on nodule formation

Auxin is a plant growth promoting hormone which is usually synthesised naturally at the apex of shoots and roots (tip region). They promote cell elongation.

IAA (indole-3-acetic acid) is a natural auxin synthesised in plants. It promotes the formation of root nodulels in leguminous plants where nitrogen fixation takes place.

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