Science for Grade 7
1 Introduction to Science
1-1 Definition of Science
1-2 Importance of Science in Daily Life
1-3 Scientific Method
1-3 1 Observation
1-3 2 Hypothesis
1-3 3 Experimentation
1-3 4 Analysis
1-3 5 Conclusion
2 Matter and Its Properties
2-1 States of Matter
2-1 1 Solid
2-1 2 Liquid
2-1 3 Gas
2-2 Properties of Matter
2-2 1 Mass
2-2 2 Volume
2-2 3 Density
2-2 4 Solubility
2-3 Changes in Matter
2-3 1 Physical Changes
2-3 2 Chemical Changes
2-4 Mixtures and Solutions
2-4 1 Types of Mixtures
2-4 2 Separation Techniques
3 Force and Motion
3-1 Types of Forces
3-1 1 Gravitational Force
3-1 2 Frictional Force
3-1 3 Magnetic Force
3-1 4 Electrostatic Force
3-2 Motion
3-2 1 Speed and Velocity
3-2 2 Acceleration
3-2 3 Newton's Laws of Motion
3-2 3-1 First Law (Inertia)
3-2 3-2 Second Law (Force and Acceleration)
3-2 3-3 Third Law (Action and Reaction)
4 Energy
4-1 Forms of Energy
4-1 1 Kinetic Energy
4-1 2 Potential Energy
4-1 3 Thermal Energy
4-1 4 Electrical Energy
4-1 5 Light Energy
4-1 6 Sound Energy
4-2 Energy Conversion
4-2 1 Mechanical to Electrical
4-2 2 Chemical to Thermal
4-2 3 Light to Electrical
4-3 Conservation of Energy
5 Heat and Temperature
5-1 Temperature
5-1 1 Measurement of Temperature
5-1 2 Temperature Scales
5-2 Heat Transfer
5-2 1 Conduction
5-2 2 Convection
5-2 3 Radiation
5-3 Effects of Heat
5-3 1 Expansion
5-3 2 Change of State
6 Light and Sound
6-1 Light
6-1 1 Sources of Light
6-1 2 Reflection
6-1 3 Refraction
6-1 4 Lenses and Mirrors
6-2 Sound
6-2 1 Production of Sound
6-2 2 Properties of Sound
6-2 3 Reflection of Sound
6-2 4 Applications of Sound
7 Earth and Space
7-1 Earth's Structure
7-1 1 Crust
7-1 2 Mantle
7-1 3 Core
7-2 Earth's Atmosphere
7-2 1 Layers of the Atmosphere
7-2 2 Weather and Climate
7-3 Solar System
7-3 1 Planets
7-3 2 Sun
7-3 3 Moon
7-4 Space Exploration
7-4 1 Rockets
7-4 2 Satellites
7-4 3 Space Stations
8 Living Organisms and Ecosystems
8-1 Classification of Living Organisms
8-1 1 Kingdoms
8-1 2 Species
8-2 Ecosystems
8-2 1 Components of an Ecosystem
8-2 2 Food Chains and Webs
8-3 Adaptations
8-3 1 Physical Adaptations
8-3 2 Behavioral Adaptations
8-4 Human Impact on Ecosystems
8-4 1 Pollution
8-4 2 Conservation Efforts
9 Health and Nutrition
9-1 Human Body Systems
9-1 1 Circulatory System
9-1 2 Respiratory System
9-1 3 Digestive System
9-1 4 Nervous System
9-2 Nutrition
9-2 1 Essential Nutrients
9-2 2 Balanced Diet
9-3 Diseases and Prevention
9-3 1 Infectious Diseases
9-3 2 Non-infectious Diseases
9-3 3 Hygiene and Prevention
10 Environmental Science
10-1 Natural Resources
10-1 1 Renewable Resources
10-1 2 Non-renewable Resources
10-2 Pollution
10-2 1 Air Pollution
10-2 2 Water Pollution
10-2 3 Soil Pollution
10-3 Sustainable Development
10-3 1 Importance of Sustainability
10-3 2 Sustainable Practices
10-4 Climate Change
10-4 1 Causes of Climate Change
10-4 2 Effects of Climate Change
10-4 3 Mitigation Strategies
9.3.3 Hygiene and Prevention Explained

Understanding Hygiene and Prevention

Key Concepts

1. Definition of Hygiene

Hygiene refers to practices and conditions that help maintain health and prevent the spread of diseases.

2. Personal Hygiene

Personal hygiene involves practices such as regular hand washing, bathing, brushing teeth, and grooming to maintain individual health.

3. Environmental Hygiene

Environmental hygiene focuses on maintaining clean and safe surroundings, including homes, schools, and public places, to prevent the spread of diseases.

4. Food Hygiene

Food hygiene involves practices to ensure that food is prepared, handled, and stored safely to prevent foodborne illnesses.

5. Water Hygiene

Water hygiene ensures that water sources are clean and safe for drinking and other uses to prevent waterborne diseases.

6. Prevention of Diseases

Prevention of diseases involves strategies such as vaccination, regular health check-ups, and lifestyle changes to reduce the risk of illness.

7. Hand Washing

Hand washing is one of the most effective ways to prevent the spread of germs and infections. It involves using soap and water to clean hands thoroughly.

8. Vaccination

Vaccination is a preventive measure that involves administering vaccines to protect against specific diseases by stimulating the immune system.

9. Healthy Lifestyle

A healthy lifestyle includes balanced diet, regular exercise, adequate sleep, and avoiding harmful habits like smoking and excessive alcohol consumption to maintain overall health.

Explanation of Each Concept

1. Definition of Hygiene

Hygiene practices are essential for maintaining health and preventing the spread of diseases. These practices include personal, environmental, food, and water hygiene.

2. Personal Hygiene

Personal hygiene practices such as regular hand washing, bathing, brushing teeth, and grooming help prevent the spread of germs and maintain individual health. These practices are crucial for preventing infections and illnesses.

3. Environmental Hygiene

Environmental hygiene focuses on maintaining clean and safe surroundings. This includes regular cleaning of homes, schools, and public places to prevent the accumulation of dirt and germs that can cause diseases.

4. Food Hygiene

Food hygiene practices ensure that food is prepared, handled, and stored safely. This includes washing hands before handling food, cooking food thoroughly, and storing food at proper temperatures to prevent foodborne illnesses.

5. Water Hygiene

Water hygiene ensures that water sources are clean and safe for drinking and other uses. This involves treating water to remove contaminants and maintaining clean water storage facilities to prevent waterborne diseases.

6. Prevention of Diseases

Prevention of diseases involves strategies such as vaccination, regular health check-ups, and lifestyle changes. These measures help reduce the risk of illness and promote overall health.

7. Hand Washing

Hand washing is one of the most effective ways to prevent the spread of germs and infections. It involves using soap and water to clean hands thoroughly, especially before eating and after using the restroom.

8. Vaccination

Vaccination is a preventive measure that involves administering vaccines to protect against specific diseases. Vaccines stimulate the immune system to produce antibodies, providing immunity against the disease.

9. Healthy Lifestyle

A healthy lifestyle includes a balanced diet, regular exercise, adequate sleep, and avoiding harmful habits like smoking and excessive alcohol consumption. These practices help maintain overall health and reduce the risk of chronic diseases.

Examples and Analogies

Example 1: Hand Washing

Think of hand washing as a shield against germs. Just as a shield protects a warrior from harm, hand washing protects the body from harmful germs and infections.

Example 2: Vaccination

Vaccination can be compared to building a fortress around the body. Just as a fortress protects a city from invaders, vaccines protect the body from harmful diseases.

Analogy: Healthy Lifestyle

A healthy lifestyle is like maintaining a well-oiled machine. Just as regular maintenance keeps a machine running smoothly, a healthy lifestyle keeps the body functioning optimally.