Topics
Natural Resources – Air, Water and Land
- Natural Resources
- Atmosphere and Its Layers
- Air Around Us
- Composition and Components of Air
- Importance of Air
- Air Pollution and Its Causes
- Water: Our Lifeline
- Availability of Water
- Composition of Water
- Importance of Water
- Scarcity of Water
- Land
- Soil Formation
- The Importance of Conserving Earth’s Natural Resources
The Living World
Diversity in Living Things and Their Classification
Disaster Management
Substances in the Surroundings –Their States and Properties
Substances in Daily Use
Nutrition and Diet
- Nutrients and Nutrition
- Component of Food
- Carbohydrates
- Diseases Due to Deficiency of Carbohydrates
- Fats (Lipids)
- Diseases Due to Deficiency of Fats
- Proteins
- Diseases Due to Deficiency of Proteins
- Vitamin and Minerals
- Diseases Due to Deficiency of Vitamin
- Diseases Due to Deficiency of Minerals
- Fibre
- Diseases Due to Deficiency of Fibre
- Water
- Diseases Due to Deficiency of Water
- A Balanced Diet
- Nourishment and Malnutrition
- Food Adulteration
Our Skeletal System and the Skin
Motion and Types of Motion
Force and Types of Force
Work and Energy
- Force, displacement and work
- Energy
- The relationship between work and energy
- Forms of Energy
- Mechanical Energy
- Heat Energy (Thermal Energy)
- Light Energy
- Sound energy
- Chemical Energy
- Transformation of Energy
- Energy Resources
- Conventional energy resources or non-renewable energy resources
- Non-conventional energy resources or renewable energy resources
- Energy saving and green energy
Simple Machines
Sound
Light and the Formation of Shadows
Fun with Magnets
The Universe
Advantages and Disadvantages of Synthetic Fibers:
| Advantages | Disadvantages |
|---|---|
| 1. These fibres can be made in large amounts. | 1. They are water repellent. Hence, do not absorb sweat from the skin. |
| 2. They are cheaper to make. | 2. Wearing them all the time can cause skin issues. |
| 3. They are strong and durable. | 3. Synthetic clothes are uncomfortable to wear, especially in summer. |
| 4. They can be used for a long time. | 4. Synthetic fabric catches fire easily. |
| 5. They are water-resistant, don’t rot, and dry quickly. | 5. If they catch fire, the cloth sticks to the skin and causes serious injuries. |
| 6. They are lightweight and comfortable to wear. | 6. Microorganisms do not decompose these fibres. |
| 7. As they have a shine, they enhance the appearance of the wearer. | 7. Some synthetic fabrics generate static electricity, causing discomfort. |
| 8. Clothes made from these threads are wrinkle-free and scratch-free. | 8. They may contribute to environmental pollution due to their non-biodegradable nature. |
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