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One of the free-living anaerobic nitrogen-fixers is:

  1. A
    Azotobacter
  2. B
    Beijerinckia
  3. C
    Rhodospirillum
  4. D
    Rhizobium

Solution & Step-by-step Explanation

Rhodospirillum is a free-living, photosynthetic, anaerobic bacterium that can fix atmospheric nitrogen. Azotobacter and Beijerinckia are free-living but aerobic. Rhizobium is symbiotic.

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One of the free-living anaerobic nitrogen-fixers is:
A
Azotobacter
B
Beijerinckia
C
Rhodospirillum
D
Rhizobium

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