Nitrifying bacteria ___________________.

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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Reduce nitrates to free nitrogen

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Solution

The correct option is A Oxidize ammonia to nitrates
Nitrifying bacteria are chemolithotrophic organisms which get their energy by oxidizing inorganic nitrogen compounds. These are present in the highest numbers in the areas where a considerable amount of ammonia is present. They oxidise this ammonia to nitrates.

The correct answer is A.

Suggest Corrections

(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

(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