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Biology The Living World Previous Year Questions Single Correct MCQ
Published on: August 13, 2026

Thiobacillus is a group of bacteria helpful in carrying out :

A
Nitrogen fixation
B
Chemoautotrophic fixation
C
Nitrification
D
Denitrificatio

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Verified by Experts
The correct answer is:
D

• Most Thiobacillus species are known for their chemoautotrophic fixation of CO₂, using energy derived from oxidizing inorganic sulfur compounds.

• Thiobacillus denitrificans, however, is a special case: it can perform denitrification, reducing nitrate (NO 3 −) to nitrogen gas (N 2 ) under anaerobic conditions. This makes it directly relevant to the nitrogen cycle, helping balance atmospheric nitrogen levels.

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