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A free-living nitrogen-fixing cyanobacte...

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

A

Anabaena

B

Nostoc

C

Chlorella

D

Tolypothrix

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The correct Answer is:
A
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DINESH PUBLICATION ENGLISH-MICROBES IN HUMAN WELFARE-RQ
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