The gas biogas is composed predominantly of

Question

Accepted Answer

D. {'text': 'Methane', 'label': 'D'}

1. NCERT defines biogas as a mixture of gases predominantly methane (CH₄).
2. Biogas is produced by microbial anaerobic activity on cellulose.
3. Other gases in biogas include CO₂ and H₂.
4. Methanogens produce this methane during anaerobic digestion of sludge.
_Source: NCERT Class 12 Biology, Ch 8 "Microbes in Human Welfare", §8.4_

Answer

{'text': 'Nitrogen', 'label': 'A'}

Answer

{'text': 'Carbon dioxide only', 'label': 'B'}

Answer

{'text': 'Ammonia', 'label': 'C'}