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The first stable product of fixation of atmospheric nitrogen in leguminous plants is:

1. Ammonia
2. NO₃⁻
3. Glutamate
4. NO₂⁻

Correct answer: Ammonia

Solution

In leguminous root nodules, nitrogenase converts atmospheric nitrogen (N₂) into ammonia (NH₃/NH₄⁺), which is the first stable product of fixation. Nitrate and nitrite are oxidation products from other nitrogen pathways, while glutamate is formed later during assimilation of ammonia.

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