alleryBiogas, commonly called 'Gobar gas', is produced by the decomposition of animal and plant wastes in the:
APresence of excess oxygen
BPresence of strong sunlight
CAbsence of oxygen
DPresence of chlorine
Answer & Solution
Correct answer: C. Absence of oxygen
1. Biogas is a mixture rich in methane produced from cow dung and plant wastes.
2. It forms by decomposition in the absence of oxygen, that is, anaerobic decomposition.
3. Oxygen, sunlight or chlorine are not required for biogas production, so A, B and D are traps.
4. Hence the answer is C.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Environmental Management", p.327_
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