Q33 / 200 · NEET 2010 (Screening) · Botany

The free-living, anaerobic nitrogen-fixer is

A
Beijerinckia
Correct answer
B
Rhodospirillum
C
Rhizobium
D
Azotobacter

Solution

Rhodospirillum is a free-living, anaerobic, nitrogen fixer. Both Beijerinckia and Azotobacter are free-living, nitrogen-fixing, aerobic microbes. Rhizobium is a symbiotic, nitrogen-fixer.

Hence, the correct answer is option: 'B'.

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