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