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Which method of solid-waste disposal involves digesting biodegradable matter by microbes or earthworms to form humus?
AComposting
BIncineration
CSanitary landfill
DSegregation
Answer & Solution
Correct answer: A. Composting
1. Solid waste is disposed by segregation, sanitary landfill, incineration and composting.
2. Composting digests biodegradable matter by microbial action or earthworms, converting it into humus.
3. Incineration burns non-biodegradable waste, landfill dumps in low areas, and segregation merely separates wastes, so B, C and D are traps.
4. Hence the answer is A.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Environmental Management", p.332_
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