Which of the following is free-living aerobic non-photosynthetic nitrogen fixing bacterium?

Rhizobium

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Azotobacter

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Nostoc

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Azospirillum

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Solution

The correct option is D Azotobacter
Azotobacter is free-living aerobic non-photosynthetic Nitrogen fixing bacterium which have wide variety of metabolic abilities, they fix atmospheric Nitrogen as they produce nitrogenase enzyme and convert it to ammonia. They are free living in soil and do not associate as symbionts.
So, the correct answer is option B.

Suggest Corrections

(A) Nitrobacter	(i) Free living aerobic nitrogen fixing organism
(B) Clostridium	(ii) Converts nitrite to nitrates
(C) Nitrosococcus	(iii) Converts ammonia to nitrite
(D) Azotobacter	(iv) Free living anaerobic nitrogen fixing organism