A) Azotobacter
B) E. coli
C) Nostoc
D) Salmonella
E) Clostridium
Correct Answer: A
Solution :
Azotobacter is free-living, aerobic non-photosynthetic nitrogen fixing bacterium. Nostoc is free-living and also symbiotic photosynthetic nitrogen fixing cyanobacteria.You need to login to perform this action.
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