Question

Which of the following is a symbiotic nitrogen fixing bacteria?

• A. Pseudomonas
• B. Rhizobium
• C. Azotobacter
• D. Nitrosomonas

Answer 1

Answer: (B)

Azotobacter, Pseudomonas and Nitrosomonas all are free living bacteria while Rhizobium shows a symbiotic relationship with leguminous plants.