NEET Biology question

A free living nitrogen fixing cyanobacterium which can also form symbiotic association with the water fern *Azolla* is

(A)Tolypothrix
(B)Chlorella
(C)Nostoc
(D)AnabaenaCorrect

Answer: (D)

Solution

*Anabaena* is a free-living, nitrogen-fixing cyanobacterium (with specialized heterocysts) that also forms a well-known symbiotic association with the water fern *Azolla*, providing it with fixed nitrogen.

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Question ID VK-087674