Question

Rhizobium fixes nitrogen by

• A. Converting gaseous nitrogen to ammonia
• B. Converting gaseous nitrogen to nitrite
• C. Converting gaseous nitrogen to nitrate
• D. None of the above

Answer 1

The correct option is A Converting gaseous nitrogen to ammonia

Rhizobium converts nitrogen to ammonia, Nitrosomonas converts the ammonia to nitrite, whereas Nitrobacter converts the same ammonia to nitrate. It is easiest for plants to take up nitrogen in the form of​ nitrates as apposed to gaseous nitrogen.