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

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

(b) Which of the following materials are biodegradable ?Animal bones, Iron nails, Plastic mugs, Leather belts, Silver foil

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(a) The waste materials which cannot be broken down into non-poisonous or harmless substances in nature are called non-biodegradable waste materials. 

Example – D.D.T and Plastics.

(b) Animal Bones and Leather Belts.

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