Q27Long answer
Think and suggest some ways to minimise waste and pollutants at their source, taking your home as an example.
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Hint: Some points are given here, you can add more. (i) Do not throw used tea leaves, solid food remains, etc. in the drain. Throw them in the dustbin. (ii) Chemicals like medicines, paints, insecticides, etc. should not be thrown in the drain, as they increase the pollution load of the sewage.