Which of the following is an aerobic nitrogen-fixing bacterium?
A. Azotobacter
B. Clostridium
C. Rhodospirillum
D. Rhodopseudomonas
Answer:A
Which of the following is an aerobic nitrogen-fixing bacterium?
A. Azotobacter B. Clostridium C. Rhodospirillum D. Rhodopseudomonas