Question:

Microorganisms that oxidise ammonia to nitrite
(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.
  • (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

Solution and Explanation

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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