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Differentiate between biodegradable and non-biodegradable substances with the help of one example each. List two changes in habit that people must adopt to dispose non-biodegradable waste, for saving the environment.

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Difference between biodegradable and non- biodegradable substances :

S.No. Biodegradable Substance Non-biodegradable Substance 
(i) The substance which are broken down into simple harmless substance in nature in due course of time by the biological processes such as action of micro-organisms. The substances which cannot be broken down into simpler, harmless substances in nature. These substances may be in solid, liquid or gaseous form and may be inert and accumulate in the environment.
(ii) Examples : Domestic waste products, sewage.  Examples - DDT and polythene bags.

Two methods of disposal of non-biodegradable waste are:

(i) Recycling : The wastes are treated and same value materials are extracted for reuse.

(ii) Incineration : Medical and toxic waste are burnt at high temperature in incineration. Incinerators transform the waste into ashes.

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