The GATE Grind

GATE 2025 ES – Question 15

Environmental Microbiology · Microbial Metabolism · 1 mark · Multiple choice

Which process is performed by autotrophic bacteria?

  1. Aerobic biodegradation of organic matter
  2. Anaerobic biodegradation of organic matter
  3. Aerobic nitrification
  4. Anaerobic denitrification

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Show answer and explanation

Correct answer: (C) Aerobic nitrification

Explanation

Conventional nitrifying bacteria obtain energy by oxidizing reduced inorganic nitrogen and assimilate inorganic carbon for cell synthesis. Organic-matter biodegradation is heterotrophic, and conventional denitrification uses organic carbon. Thus the intended process is **aerobic nitrification, C**.

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