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(a) What is meant by biodegradable waste materials ? Give two examples of biodegradable wastes.

(b) Which of the following materials are non-biodegradable ? Aluminium wire, Tea leaves, Synthetic fibre, Wool.

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(a) The waste materials which can be broken down to non- poisonous substances in nature in due course of time by the action of micro-organisms like certain bacteria are called biodegradable waste materials. 

Example : Paper and wool. 

(b) Aluminum wire and Synthetic fibre.

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