A) Beijerinckia
B) Rhodospirillum
C) Rhizobium
D) Azotobacter
Correct Answer: B
Solution :
Rhodospirillum is a free-living, anaerobic, nitrogen fixer. Both Beijerinckia and Azotobacter are free-living, nitrogen-fixing, aerobic microbes. Khizobium is a symbiotic, nitrogen-fixer.
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