Q1 of 35 Page 131

i) Classify the following substances – wood, paper, plastic and grass.

ii) Give a detailed account of your classification.

(i) The given substances can be classified as biodegradable and non-biodegradable as shown below: Biodegradable : wood, paper and grass non-Biodegradable : Plastic


(ii) Substances which can be broken down by biological processes or microbial action are known as Biodegradable. Wood, paper, leaves, cotton etc. are some examples of biodegradable substances. While substances which are not broken down by biological processes or microbial action are known as Non-biodegradable. Plastic, cans, tyres, paints etc. are some examples of Non-biodegradable substances.


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i) Which line (A or B) represents the flow of energy?


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ii) Define process 1.


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