Nitrifying bacteria

reduce nitrates to free nitrogen

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oxidize ammonia to nitrates

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convert free nitrogen to nitrogen compounds

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convert proteins to ammonia

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Solution

The correct option is B
oxidize ammonia to nitrates

The nitrification process requires the mediation of two distinct groups: bacteria that convert ammonia to nitrites and bacteria that convert nitrites to nitrates.

Suggest Corrections

(A) Nitrobacter	(i) Free living aerobic nitrogen fixing organism
(B) Clostridium	(ii) Converts nitrite to nitrates
(C) Nitrosococcus	(iii) Converts ammonia to nitrite
(D) Azotobacter	(iv) Free living anaerobic nitrogen fixing organism

(a)	Nitrobacter	(i)	Free living aerobic nitrogen fixer
(b)	Clostridium	(ii)	Converts ammonia into nitrite
(c)	Nitrosococcus	(iii)	Changes nitrite to nitrate
(d)	Azotobacter	(iv)	Free living anaerobic nitrogen fixer