Question:
Microorganisms that oxidise ammonia to nitrite
(A) Nitrosomonas
(B) Thiobacillus
(C) Nitrobacter
(D) Nitrosolobus
Choose the correct answer from the options given below:
Microorganisms that oxidise ammonia to nitrite
(A) Nitrosomonas
(B) Thiobacillus
(C) Nitrobacter
(D) Nitrosolobus
Choose the correct answer from the options given below:
(A) Nitrosomonas
(B) Thiobacillus
(C) Nitrobacter
(D) Nitrosolobus
Choose the correct answer from the options given below:
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Nitrosomonas and Nitrosolobus convert ammonia to nitrite in nitrification.
Updated On: Jul 2, 2026
- (A), (B) and (D) only.
- (A) and (D) only.
- (A), (B), (C) and (D).
- (B), (C) and (D) only.
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The Correct Option is B
Approach Solution - 1
Ammonia is oxidized to nitrite by Nitrosomonas and Nitrosolobus. Nitrobacter oxidizes nitrite to nitrate, and Thiobacillus is a sulfur-oxidizing bacterium, not involved in nitrification.
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Approach Solution -2
Splitting nitrification into its two stages: Nitrification happens in two steps carried out by different groups of bacteria.
Stage one, ammonia oxidation to nitrite, is carried out by ammonia-oxidising bacteria such as Nitrosomonas and Nitrosolobus.
Stage two, nitrite oxidation to nitrate, is carried out by a different group including Nitrobacter, so it does not belong with the ammonia oxidisers.
Thiobacillus is unrelated to nitrogen cycling altogether, being a sulphur-oxidising bacterium.
So only Nitrosomonas and Nitrosolobus correctly perform ammonia-to-nitrite oxidation.
Stage one, ammonia oxidation to nitrite, is carried out by ammonia-oxidising bacteria such as Nitrosomonas and Nitrosolobus.
Stage two, nitrite oxidation to nitrate, is carried out by a different group including Nitrobacter, so it does not belong with the ammonia oxidisers.
Thiobacillus is unrelated to nitrogen cycling altogether, being a sulphur-oxidising bacterium.
So only Nitrosomonas and Nitrosolobus correctly perform ammonia-to-nitrite oxidation.
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