Page 4 - Science Class 08

Contents

1. Crop Production 5 12. Force and Pressure 116
• Agriculture What are Crops? Methods of Crop • • • Effect of Force Types of Force – Contact Force and •
Produc on Crop Seasons Crop Improvement• • Non-contact Force Pressure Applica on of Pressure • •
• Our Responsibility in Our Daily Life Atmospheric Pressure •
2. The World of Microbes 16 13. All About Sound 128
• Microbes Habitats of Microbes Microbe-Culture• • • What is Sound? • Terms Related to Sound How to •
• Chief Microbe Group: Bacteria, Fungi, Algae, Dis nguish Sound? Sound and Audibility Propaga on • •
Protozoa, Virus Food Poisoning • of Sound Sound and Various Mediums Speed of • •
3. Materials in Daily Life 27 Sound
• Materials : Natural and Man-made Synthe c Fibres • 14. Reflection of Sound 136
• Rayon • Nylon • Polyester • Need for Synthe c • Sound Waves How Sound is Heard? Reflec on of • •
Materials Polymerisa on Plas cs • • Sound Echoes Absorp on of Sound Musical • • •
4. Metals and Non–Metals 39 Sounds • Musical Instruments • Human Voice Animal •
• Metals Extrac on Physical Proper es of Metals• • Sound
• Chemical Proper es of Metals • Uses of Metals 15. Electrical Charge and Flow of Electricity 144
• Corrosion • Prevailing Corrosion • Electric Charges • Electric Charges in Atoms Charging •
5. More About Metals 49 a Body Electroscope Electric Current Lightning • • •
• Noble Metals Non-metals Occurrence Extrac on • • • 16. Chemical Effects of Current 153
• Physical Proper es • Chemical Proper es • Uses of • Electrolysis • Ion • Electropla ng • Chemical Analysis
Non-metals Alloys• of lectropla ng • Importance of Electropla ng E
6. Coal and Petroleum 58 • Electropla ng in Industries
• Fuel Characteris cs of a Good Fuel Sources of • • 17. Light : Its Refraction 162
Energy Types of Fuels Petroleum Coal Natural • • • • • Refrac on of Light • Laws of Refrac on • Refrac ve
Gas Role of Energy in Modern Development Causes • • Index • Denser and Rare Medium • Refrac on Through
of Energy Crisis Preven ng an Energy Crisis • a Glass Slab • Refrac on Through a Prism • Dispersion
7. Combustion and Flame 71 of Light • Op cal Illusion
• Combus on Supporter of Combus on Types of • • 18. Optical Lenses and Devices 171
Combus on How to Control Fire? Flame The Effect • • • • Development of Lens • Images Through Lenses
of Burning of Fuels on Environment • Op cal Devices • The Human Eye
8. Conservation of Plants and Animals 79 19. The Universe 181
• Importance of Forests Deforesta on • • • The Universe • Galaxies • Stars • Planets • The Pole
Consequences of Deforesta on Conserva on of • Star • Constella ons • The Solar System • Earth’s
Forests • Wildlife • Conserva on of Wildlife Endemic • Natural Satellite • Ar ficial Satellite
Species Threatened Species Red Data Book• • 20. Some Natural Phenomena 196
9. Structure and Functions of Cells 89 • Lightning • Lightning Safety • Earthquakes • Causes of
• About the Cell Cells are Common to All Variety in • • Earthquake • Earthquake Terminology • Seismic Zones
Cells Structure of a Cell Nucleus Plant and Animal • • • in India • Preven ve Measures
Cells 21. Pollution of Air and Water 204
10. Reproduction in Animals 97 • Air pollu on
• Methods of Reproduc on Sexual Reproduc on • — Sources of ir ollu onA P
• Bisexual and Unisexual organisms • Fer lisa on — Harmful ffects of ir ollu on E A P
• Reproduc on in Humans • Test Tube Babies • Asexual — Preven on and Control of A Pir ollu on
Reproduc on • Water pollu on
11. Reaching the Age of Adolescence 107 — Sources of Water Pollu on
• Adolescence Puberty Changes of Puberty • • — Effects of Water Pollu on
• Secondary Sexual Character • Endocrine Glands — Preven on and Control of Water Pollu on
• Reproduc ve Phase of Life in Humans • How is the — Potable Water

Sex of the Baby Determined? Reproduc ve Health • Model Test Paper-1 & 2 213