What are non-biodegradable substances ?

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Solution

These are substances which cannot be broken down by the activity of microorganisms. These substances go on concentrating at each trophic level of food chain, e.g., DDT and heavy metal (mercury, cadmium, etc.).

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Radioactive substances are non-biodegradable.

Question 1
Why are some substances biodegradable and some non-biodegradable?

Substances which cannot be decomposed by micro-organisms are called non-biodegradable substances.

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