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Q.

Which of the given monerans fixes nitrogen symbiotically as well as in free-living state?

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a

Anabaena

b

Rhizobium

c

Azotobacter

d

Frankia

answer is D.

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Detailed Solution

Anabaena is a filamentous autotrophic cyanobacteria, fixes nitrogen symbiotically as well as in free-living state. Anabaena  azollae, although it can exist on it’s own, is usually found within ovoid cavities inside the leaves of the water fern Azolla. 

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