A) Rhizobium \[\to \] Alfalfa
B) Frankia \[\to \] Alnus
C) Rhodospirillum \[\to \] Aerobic
D) Bacillus \[\to \] Free ?living
Correct Answer: B
Solution :
[c] Rhodospirillum is a free-living, anaerobic photoautotrophic nitrogen-fixing bacteria.
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