Why are some substances biodegradable and some non-biodegradable ?

Why are some substances biodegradable and some non-biodegradable ?

Ans. The wastes we generate in our daily life are biodegradable and non-biodegradable. It is so because in our environment are present micro-organisms (bacteria and fungi of decay) which secrete enzymes. These enzymes degrade organic compounds, present in the dead remains of plants and animals and their waste products, into simpler substances. Such wastes are termed biodegradable. On the other hand, these enzymes can not degrade certain category of wastes such as plastics, glass objects etc. These wastes, therefore, persist as such in the environment and are termed as non-biodegradable wastes.

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