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Answer: 4. Denitrification

Thiobacillus species oxidise sulphur compounds. The key lists Thiobacillus denitrificans, which converts nitrate to nitrogen gas, so the NCERT-based answer is denitrification.

Nitrogen fixation uses Rhizobium and Azotobacter, and nitrification uses Nitrosomonas and Nitrobacter. Option 4 is the official answer.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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