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Page, Teacher, Date, Title, No. Sign/Remar, Serial, CH-I. SOLIDS,, LIQUIDS AND GASES, 1., CH-2 FORCE,, WORK AND ENERGY -, 18/u/21 CH-3 SOLAR-H--, aV SYSTEM S, 4, 25 ua CH-4 KEEPING, OUR EARTH CLEAN, 29, woH, 3.

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DATE:, PAGE NO.:, CHAPTER- 4, KEEPING., OUR EARTH, CLEAN

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DATE:, PAGE NO.:, OI Define poltution and pollutants., Ans, The presence of harmful, substances in air, water and, Hand is knawn as poltution, These harmful substances ore, called pollutonts, 02 Give differences between, afforestation and deforestation, Ans, Planting trees in targe, mumbers is known as, afforestation where, doon of trees at large scate, is known as deforestation, as, cutting, IS

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DATE:, PAGE NO.:, 03 Disfferentiate between, biodegradable waste and, men- biodegradable Daste, non-, 1oas, Waste which ca decompose., Ans, or rot easily are known aS, biodegradable coaste, eg peels of vegetables and paper, en the other hard, waste that, do not decompose or rot are, known os non- biodegradable, waste, eg: plastic and glosES