Q42 of 163 Page 227

Which of the following materials are biodegradable?

Animal bones, Iron nails, Plastic mugs, Leather belts, Silver foil

(B) Biodegradable substances are those that can be degraded by bacteria and do not cause pollution. Amongst the following, Animal bones and leather belts are biodegradable.


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41

Which of the following materials are non-biodegradable?

Aluminum wire, Tea leaves, Synthetic fibre, wool

 42

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

 43

Define an ecosystem. Give examples of any two ecosystems.

 43

List the biotic and abiotic components of an ecosystem.