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Question
Rhizobium fixes nitrogen by
Options:
A .  Converting gaseous nitrogen to ammonia
B .  Converting gaseous nitrogen to nitrite
C .  Converting gaseous nitrogen to nitrate
D .  None of the above
Answer: Option A
:
A
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.

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