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

Nostoc

B

Anabaena

C

Tolypothrix

D

Chlorella

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The correct Answer is:

B

Anabaena, Azolla maintains a mutually beneficial symbiotic relationship with the water fern Azolla which provide the cyanobacteria with a safe environment in exchange for nitrogen.

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