Microorganisms: Classification and Habitat

02 Friendly Microorganisms

03 Harmful Microorganisms

04 Food Preservation and Food Poisoning

05 Nitrogen Fixation and Nitrogen Cycle

01 Synthetic Fibres and their properties

02 Types of Synthetic Fibres

Plastics

Useful Properties of Plastics

Plastic and the Environment

Physical Properties of Metals and Nonmetals

Chemical Properties of Metals and nonmetals: Reaction with Oxygen and Water

Chemical Properties of Metals and Nonmetals: Reaction with Acids and Bases, and Displacement Reaction

Uses of Metals and Nonmetals

01 Natural and Manmade Resources

02 Coal

03 Petroleum

04 Natural Gas

05 Limitations of Natural Resources

01 Deforestation

02 Flora and Fauna

03 Conservation of Forest and Wildlife: Wildlife Sanctuary and Biosphere Reserve

04 Conservation of Forest and Wildlife: National Park

05 Recycling of Paper and Reforestation

01 Force – A Push or Pull

02 Effects of Force on Objects

Contact Forces

Non-Contact forces

Pressure

Pressure exerted by Liquids

Pressure exerted by Gases and Atmospheric Pressure

01 Friction Force and its Dependency

02 Friction: a Necessary Evil

03 Increasing and Decreasing the Friction

04 Fluid Friction

Sound Production

Propagation of Sound

03 Ear

04 Amplitude, Time Period And Frequency of Vibration

05 Noise and Music

01 Introduction to cell

02 Variety in Cell Number, Shape and Size

Structure, Function and Parts of Cell: Basic Components

Structure, Function and Parts of Cell: Other Components and Comparison of Plant and Animal cells

01 Modes of Reproduction

02 Sexual Reproduction: Reproductive System

03 Sexual Reproduction: Fertilization

04 Development of Embryo

05 Asexual Reproduction

01 Adolescence, Puberty and Reproductive Phase of Life

02 Changes at Puberty

03 Role of Hormones in Organisms

04 Sex Determination

05 Reproductive Health

01 Do Liquids Conduct Electricity?

02 Chemical Effect of Electric Current

03 Electroplating

04 Uses of Electroplating

01 Electric Charge: Nature, Types and Transfer

02 Lightning: What is lightning

03 Lightning: Safety Measures

Earthquakes

Protection against Earthquakes

01 Light: Laws of Reflection

02 Image formation by Plane Mirror

03 Multiple Images, Kaleidoscope and Dispersion

04 Human Eye

05 Care of Eyes

06 Can a Visually Challenged Persons Read and Write?

01 The Night Sky and the Moon

02 The Stars

03 Constellations

04 The Structure of Solar System

05 Planets in the Solar System

06 Other Members of Solar System

07 Artificial Satellites

Air Pollution: The pollutants

Acid Rain

Global Warming and Greenhouse Effect

04 The Oxygen cycle and The Ozone Layer

Ways to Reduce Air Pollution

Water Pollution

Sources of Water Pollution

08 Pollution of Ganga River: A Case Study

09 Purification of water and ways to reduce water pollution