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GK QUESTION#3423

Assertion (A): Methane is not a major component of biogas.

Reason (R): Biogas is produced by anaerobic microbial decomposition of organic matter.

  1. ABoth A and R are true, and R is the correct explanation of A
  2. BBoth A and R are true, but R is not the correct explanation of A
  3. CA is true, but R is false
  4. DA is false, but R is trueCorrect answer
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Answer

D. A is false, but R is true

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Explanation

Methane is a major component of biogas, along with carbon dioxide, so assertion A is false. Anaerobic microbial decomposition of organic matter produces biogas, so R is true. The microbial community includes bacteria and methane-producing archaea; describing the process as microbial decomposition is more precise.

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