Q5 of 38 Page 109

Differentiate between biodegradable and non-biodegradable substances. Cite examples.

1. Biodegradable substances are those which can be degraded or break down with the help of biological processes whereas biodegradable substances can’t be break down with the help of biological processes into organic substances.


2. Biodegradable substances are friendly to environment as they don’t provide any harm to environment whereas non-biodegradable substances are not environment friendly and can prove hazardous to nature.


3. Examples of biodegradable substances are paper, fruit peels, cloth bags etc. Examples of non-biodegradable substances are: plastic cans, glass and polybags.

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Suggest one word for each of the following statements/ definitions

(a) The physical and biological world where we live in


(b) Each level of food chain where transfer of energy takes place


(c) The physical factors like temperature, rainfall, wind and soil of an ecosystem


(d) Organisms which depend on the producers either directly or indirectly for food

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Explain the role of decomposers in the environment?