Chapter 1

Crop Production and Management

Agricultural Practices

medium • 1 min read

Basic Practices of Crop Production

medium • 2 min read

Preparation of Soil

medium • 3 min read

Sowing

medium • 4 min read

Adding Manure and Fertilisers

medium • 5 min read

Irrigation

medium • 6 min read

Protection from Weeds

medium • 7 min read

Harvesting

medium • 8 min read

Storage

medium • 9 min read

Food from Animals

medium • 10 min read

Chapter 2

Microorganisms: Friend and Foe

Microorganisms

medium • 1 min read

Where do Microorganisms Live?

medium • 2 min read

Microorganisms and Us

medium • 3 min read

Harmful Microorganisms

medium • 4 min read

Food Preservation

medium • 5 min read

Nitrogen Fixation

medium • 6 min read

Nitrogen Cycle

medium • 7 min read

Chapter 3

Synthetic Fibres and Plastics

What are Synthetic Fibres?

medium • 1 min read

Types of Synthetic Fibres

medium • 2 min read

Characteristics of Synthetic Fibres

medium • 3 min read

Plastics

medium • 4 min read

Plastics as Materials of Choice

medium • 5 min read

Plastics and the Environment

medium • 6 min read

Chapter 4

Materials: Metals and Non-Metals

Physical Properties of Metals and Non-metals

medium • 1 min read

Chemical Properties of Metals and Non-metals

medium • 2 min read

Uses of Metals and Non-metals

medium • 3 min read

Chapter 5

Coal and Petroleum

Coal

medium • 1 min read

Petroleum

medium • 2 min read

Natural Gas

medium • 3 min read

Some Natural Resources are Limited

medium • 4 min read

Chapter 6

Combustion and Flame

What is Combustion?

medium • 1 min read

How Do We Control Fire?

medium • 2 min read

Types of Combustion

medium • 3 min read

Flame

medium • 4 min read

Structure of a Flame

medium • 5 min read

What is a Fuel?

medium • 6 min read

Fuel Efficiency

medium • 7 min read

Chapter 7

Conservation of Plants and Animals

Deforestation and Its Causes

medium • 1 min read

Consequences of Deforestation

medium • 2 min read

Conservation of Forest and Wildlife

medium • 3 min read

Biosphere Reserve

medium • 4 min read

Flora and Fauna

medium • 5 min read

Endemic Species

medium • 6 min read

Wildlife Sanctuary

medium • 7 min read

National Park

medium • 8 min read

Red Data Book

medium • 9 min read

Migration

medium • 10 min read

Recycling of Paper

medium • 11 min read

Reforestation

medium • 12 min read

Chapter 8

Cell - Structure and Functions

Discovery of the Cell

medium • 1 min read

The Cell

medium • 2 min read

Organisms show Variety in Cell Number, Shape and Size

medium • 3 min read

Cell Structure and Function

medium • 4 min read

Parts of the Cell

medium • 5 min read

Comparison of Plant and Animal Cells

medium • 6 min read

Chapter 9

Reproduction in Animals

Modes of Reproduction

medium • 1 min read

Sexual Reproduction

medium • 2 min read

Asexual Reproduction

medium • 3 min read

Chapter 10

Reaching the Age of Adolescence

Adolescence and Puberty

medium • 1 min read

Changes at Puberty

medium • 2 min read

Secondary Sexual Characters

medium • 3 min read

Role of Hormones in Initiating Reproductive Function

medium • 4 min read

Reproductive Phase of Life in Humans

medium • 5 min read

How is the Sex of the Baby Determined?

medium • 6 min read

Hormones other than Sex Hormones

medium • 7 min read

Role of Hormones in Completing the Life History of Insects and Frogs

medium • 8 min read

Reproductive Health

medium • 9 min read

Chapter 11

Force and Pressure

Force: A Push or a Pull

medium • 1 min read

Forces are due to an Interaction

medium • 2 min read

Exploring Forces

medium • 3 min read

A Force can Change the State of Motion

medium • 4 min read

Force can Change the Shape of an Object

medium • 5 min read

Contact Forces

medium • 6 min read

Non-contact Forces

medium • 7 min read

Pressure

medium • 8 min read

Pressure Exerted by Liquids and Gases

medium • 9 min read

Atmospheric Pressure

medium • 10 min read

Chapter 12

Friction

Force of Friction

medium • 1 min read

Factors affecting Friction

medium • 2 min read

Friction: A Necessary Evil

medium • 3 min read

Increasing and Reducing Friction

medium • 4 min read

Wheels Reduce Friction

medium • 5 min read

Fluid Friction

medium • 6 min read

Chapter 13

Sound

Sound is Produced by a Vibrating Body

medium • 1 min read

Sound Produced by Humans

medium • 2 min read

Sound Needs a Medium for Propagation

medium • 3 min read

We Hear Sound through Our Ears

medium • 4 min read

Amplitude, Time Period and Frequency of a Vibration

medium • 5 min read

Audible and Inaudible Sounds

medium • 6 min read

Noise and Music

medium • 7 min read

Noise Pollution

medium • 8 min read

Chapter 14

Chemical Effects of Electric Current

Do Liquids Conduct Electricity?

medium • 1 min read

Chemical Effects of Electric Current

medium • 2 min read

Electroplating

medium • 3 min read

Chapter 15

Some Natural Phenomena

Lightning

medium • 1 min read

Charging by Rubbing

medium • 2 min read

Types of Charges and Their Interaction

medium • 3 min read

Transfer of Charge

medium • 4 min read

The Story of Lightning

medium • 5 min read

Lightning Safety

medium • 6 min read

Earthquakes

medium • 7 min read

Chapter 16

Light

What makes Things Visible?

medium • 1 min read

Laws of Reflection

medium • 2 min read

Regular and Diffused Reflection

medium • 3 min read

Reflected Light Can be Reflected Again

medium • 4 min read

Multiple Images

medium • 5 min read

Sunlight - White or Coloured

medium • 6 min read

What is inside Our Eyes?

medium • 7 min read

Care of the Eyes

medium • 8 min read

Visually Impaired Persons Can Read and Write

medium • 9 min read

What is the Braille System?

medium • 10 min read

Chapter 17

Stars and the Solar System

The Moon

medium • 1 min read

The Stars

medium • 2 min read

Constellations

medium • 3 min read

The Solar System

medium • 4 min read

Some Other Members of the Solar System

medium • 5 min read

Chapter 18

Pollution of Air and Water

Air Pollution

medium • 1 min read

How does Air Get Polluted?

medium • 2 min read

Case Study: The Taj Mahal

medium • 3 min read

Greenhouse Effect

medium • 4 min read

What can be done?

medium • 5 min read

Water Pollution

medium • 6 min read

How does Water Get Polluted?

medium • 7 min read

What is Potable Water and How is Water Purified?

medium • 8 min read