(a) What is meant by non-biodegradable waste materials? Give two examples of non- biodegradable wastes. (b) Which of the following materials are biodegradable? Animal bones, Iron nails, Plastic mugs, Leather belts, Silver foil

(a) The waste material that cannot be broken down into non-poisonous substances also that cannot be decomposed and recycled is called non-biodegradable waste. Example: Plastic, polythene bags etc.

(b) Animal bones and leather belts are biodegradable wastes.