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CGP EDU Academic Team
Published on: August 20, 2026
A free living nitrogen–fixing cyanobacterium which can also form symbiotic association with the water fern Azolla is :-
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Verified by ExpertsThe correct answer is:
A
A nabaena is a free-living nitrogen-fixing cyanobacterium that also lives in symbiotic association with the water fern Azolla (in its leaf cavities), helping in nitrogen fixation.
• Tolypothrix → free-living, but not commonly associated with Azolla
• Chlorella → green alga, no nitrogen fixation
• Nostoc → nitrogen-fixing, but Azolla association is specifically with Anabaena.
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