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18.9 Purification of water and ways to reduce water pollution

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18.09 Purification of water and ways to reduce water pollution

CBSE 8 Science

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01 Crop Production and Management

1.1 Agricultural Practices and Cropping Pattern
1.2 Preparation of Soil
1.3 Sowing
1.4 Adding Manure and Fertilisers
1.5 Irrigation
1.6 Protection from Weeds and Harvesting
1.7 Storage and Food From Animals
Chapter 1 Crop Production and Management - Test

02 Microorganisms Friend and Foe

2.1 Microorganisms: Classification and Habitat
2.2 Friendly Microorganisms
2.3 Harmful Microorganisms
2.4 Food Preservation and Food Poisoning
2.5 Nitrogen Fixation and Nitrogen Cycle
Chapter 2 Microorganisms Friend and Foe - Test

03 Synthetic Fibres and Plastics

3.1 Synthetic Fibres and their properties
3.2 Types of Synthetic Fibres
3.3 Plastics
3.4 Useful Properties of Plastics
3.5 Plastic and the Environment
Chapter 3 Synthetic Fibres and Plastics - Test

04 Materials: Metals and Non-Metals

4.1 Physical Properties of Metals and Nonmetals
4.2 Chemical Properties of Metals and nonmetals: Reaction with Oxygen and Water
4.3 Chemical Properties of Metals and Nonmetals: Reaction with Acids and Bases, and Displacement Reaction
4.4 Uses of Metals and Nonmetals
Chapter 4 Materials: Metals and Nonmetals - Test

05 Coal and Petroleum

5.1 Natural and Manmade Resources
5.2 Coal
5.3 Petroleum
5.4 Natural Gas
5.5 Limitations of Natural Resources
Chapter 5 Coal and Petroleum - Test

06 Combustion And Flame

6.1 Combustion: Concept and Conditions
6.2 Types of Combustion Reaction, Ignition Temperature and Fire Control
6.3 Flame
6.4 Fuel
6.5 Harmful Effects of Burning Fuels
Chapter 6 Combustion and Flame - Test

07 Conservation of Plants and Animals

7.1 Deforestation
7.2 Flora and Fauna
7.3 Conservation of Forest and Wildlife: Wildlife Sanctuary and Biosphere Reserve
7.4 Conservation of Forest and Wildlife: National Park
7.5 Recycling of Paper and Reforestation
Chapter 7 Conservation of Plants and Animals - Test

08 Cell - Structure and Functions

8.1 Introduction to cell
8.2 Variety in Cell Number, Shape and Size
8.3 Structure, Function and Parts of Cell: Basic Components
8.4 Structure, Function and Parts of Cell: Other Components and Comparison of Plant and Animal cells
Chapter 8 Cell - Structure and Functions - Test

09 Reproduction in Animals

9.1 Modes of Reproduction
9.2 Sexual Reproduction: Reproductive System
9.3 Sexual Reproduction: Fertilization
9.4 Development of Embryo
9.5 Asexual Reproduction
Chapter 9 Reproduction in Animals - Test

10 Reaching the Age of Adolescence

10.1 Adolescence, Puberty and Reproductive Phase of Life
10.2 Changes at Puberty
10.3 Role of Hormones in Organisms
10.4 Sex Determination
10.5 Reproductive Health
Chapter 10 Reaching The Age Of Adolescence - Test

11 Force And Pressure

11.1 Force - A Push or Pull
11.2 Effects of Force on Objects
11.3 Contact Forces
11.4 Non-Contact forces
11.5 Pressure
11.6 Pressure exerted by Liquids
11.7 Pressure exerted by Gases and Atmospheric Pressure
Chapter 11 Force and Pressure - Test

12 Friction

12.1 Friction Force and its Dependency
12.2 Friction: a Necessary Evil
12.3 Increasing and Decreasing the Friction
12.4 Fluid Friction
Chapter 12 Friction - Test

13 Sound

13.1 Sound Production
13.2 Propagation of Sound
13.3 Ear
13.4 Amplitude, Time Period And Frequency of Vibration
13.5 Noise and Music
Chapter 13 Sound - Test

14 Chemical Effects of Electric Current

14.1 Do Liquids Conduct Electricity?
14.2 Chemical Effect of Electric Current
14.3 Electroplating
14.4 Uses of Electroplating
Chapter 14 Chemical Effects of Electric Current - Test

15 Some Natural Phenomena

15.1 Electric Charge: Nature, Types and Transfer
15.2 Lightning: What is lightning
15.3 Lightning: Safety Measures
15.4 Earthquakes
15.5 Protection against Earthquakes
Chapter 15 Some Natural Phenomena - Test

16 Light

16.1 Light: Laws of Reflection
16.2 Image formation by Plane Mirror
16.3 Multiple Images, Kaleidoscope and Dispersion
16.4 Human Eye
16.5 Care of Eyes
16.6 Can a Visually Challenged Persons Read and Write?
Chapter 16 Light - Test

17 Stars and the Solar System

17.1 The Night Sky and the Moon
17.2 The Stars
17.3 Constellations
17.4 The Structure of Solar System
17.5 Planets in the Solar System
17.6 Other Members of Solar System
17.7 Artificial Satellites
Chapter 17 Stars and The Solar System - Test

18 Pollution of Air and Water

18.1 Air Pollution: The pollutants
18.2 Acid Rain
18.3 Global Warming and Greenhouse Effect
18.4 The Oxygen cycle and The Ozone Layer
18.5 Ways to Reduce Air Pollution
18.6 Water Pollution
18.7 Sources of Water Pollution
18.8 Pollution of Ganga River: A Case Study
18.9 Purification of water and ways to reduce water pollution
Chapter 18 Pollution of Air and Water - Test

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