Ownclasses

The free-living, anaerobic nitrogen - fixer is 

  • Beijerinckia

  • Rhodospirillum

  • Rhizobium

  • Azotobacter

Answer

B.

Rhodospirillum

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

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