Which one of the following is free livin...

Which one of the following is free living nitrogen fixing cyanobacterium ?

A

(a) Cylindrospermum

B

(b) Nostoc

C

(c) Rhodospirillum

D

(d) both a and b

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The correct Answer is:

D

Many free living blue-green algae or xyanobacteria perform nitrogen fixtion, e.g., Anabaena, Nostoc, Cylindrospermum, etc.

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