NEET 2004 Biology question

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

(1)Chlorella
(2)Nostoc
(3)AnabaenaCorrect
(4)Tolypothrix

Answer: (3)

Solution

Anabaena azollae lives symbiotically in the leaf cavities of the water fern Azolla and fixes nitrogen there, while free-living Anabaena species also fix nitrogen in rice fields; hence Anabaena is the answer. Chlorella is a

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Question ID VK-089504