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##### Chapter 1 Crop Production and Management

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##### Chapter 2 Microorganisms: Friend and Foe

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##### Chapter 3 Synthetic Fibres and Plastics

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##### Chapter 4 Materials: Metals and Non-Metals

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##### Chapter 5 Coal and Petroleum

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##### Chapter 6 Combustion and Flame

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##### Chapter 7 Conservation of Plants and Animals

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##### Chapter 8 Cell - Structure and Functions

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##### Chapter 9 Reproduction in Animals

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##### Chapter 10 Reaching the Age of Adolescence

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##### Chapter 11 Force and Pressure

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##### Chapter 12 Friction

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##### Chapter 13 Sound

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##### Chapter 14 Chemical Effects of Electric Current

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##### Chapter 15 Some Natural Phenomena

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##### Chapter 16 Light

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##### Chapter 17 Stars and The Solar System

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##### Chapter 18 Pollution of Air and Water

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