Which of the following is not a free-living Nitrogen-fixing bacteria?
A. Azotobacter
B. Clostridium
C. Klebsiella
D. Xanthomonas
Answer:D
Which of the following is not a free-living Nitrogen-fixing bacteria?
A. Azotobacter B. Clostridium C. Klebsiella D. Xanthomonas