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Which group of microorganisms commonly forms nitrogen‑fix... | QuestionStock

Representative image for question: Which group of microorganisms commonly forms nitrogen‑fixing nodules on the roots of legumes, converting atmospheric nitrogen into a plant‑usable form?

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Which group of microorganisms commonly forms nitrogen‑fixing nodules on the roots of legumes, converting atmospheric nitrogen into a plant‑usable form?

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Which group of microorganisms commonly forms nitrogen‑fixing nodules on the roots of legumes, converting atmospheric nitrogen into a plant‑usable form?

Options:

Rhizobium bacteria
Mycorrhizal fungi
Cyanobacteria
Azotobacter

Correct answer: Rhizobium bacteria

Explanation: Rhizobium bacteria form symbiotic nodules on legume roots and use the nitrogenase enzyme to convert atmospheric N2 into ammonia, supplying biologically available nitrogen to the host plant.

Created 2026-03-10T17:15:00.485Z. Updated 2026-03-10T17:15:00.485Z.