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Q.

How many of the following are biofertilizers that can fix both carbon dioxide and atmospheric nitrogen?
Rhizobium, Azotobacter, Nostoc, Oscillatoria, Glomus, Azospirillum, Anabaena

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a

Three

b

Two

c

Five

d

Four

answer is A.

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Detailed Solution

Cyanobacteria are autotrophic microbes widely distributed in aquatic and terrestrial environments many of which can fix atmospheric nitrogen, e.g. Anabaena, Nostoc, Oscillatoria, etc. 

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