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Which of the following is a nonbiodegradable pollutant?

1. DDT
2. Sewage
3. Plant leaves
4. Domestic wastes

Correct answer: DDT

Solution

DDT is a synthetic pesticide that is highly persistent and does not decompose easily, so it is considered nonbiodegradable. Sewage, plant leaves, and domestic wastes are generally biodegradable because microorganisms can break them down.

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