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Q.

Identify the free living and anaerobic nitrogen fixer.

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a

Anabaena

b

Rhodospirillum

c

Azotobacter

d

Beijerinckia

answer is D.

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Detailed Solution

Rhodospirillum is anaerobic and free-living nitrogen fixer. 
Azotobacter and Beijerinckia are free-living nitrogen-fixing aerobic microbes. 
Cyanobacteria such as Anabaena and Nostoc are also free-living nitrogen-fixers. The cells of Anabaena and Nostoc shows metabolic compartmentalization only at the site where the enzyme nitrogenase is present. 

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Identify the free living and anaerobic nitrogen fixer.