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 into ammonia.

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Solution

The correct option is A Oxidize ammonia to nitrates.
Soil bacteria that change ammonia or ammonium into nitrite or change nitrite into nitrate as part of the nitrogen cycle is called as nitrifying bacteria. Nitrification is an aerobic process performed by small groups of autotrophic bacteria and archaea.

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