Class 8 Science Chapter 3, Health: The Ultimate Treasure, opens with real public-health headlines on screen time, diabetes, air pollution, monsoon vector-borne diseases, yoga and handwashing, then covers physical and mental health, communicable and non-communicable diseases, vaccines and prevention.
What Class 8 Science Chapter 3 Covers
3.1 Health: Is It More Than Not Falling Sick? and 3.2 How Can We Stay Healthy? define health as physical, mental and social well-being, and trace daily habits—balanced diet, regular exercise, sleep, hygiene and limiting screen time.
3.3 How Do We Know That We Are Unwell? and 3.4 Causes and Types of Diseases distinguish symptoms from signs and compare communicable diseases (spread by pathogens through air, water, food, contact or vectors) with non-communicable lifestyle and deficiency diseases.
3.5 How to Prevent and Control Diseases? covers sanitation, safe drinking water, vector control, the discovery of vaccines, immunity and responsible use of antibiotics.
Exercises in Chapter 3
- Keep the curiosity alive end-of-chapter questions and reasoning exercises.
- Discover, design, and debate and Projects for hands-on investigation.
Read Class 8 Science Chapter 3 Online
More Chapters
- Previous: Chapter 2: The Invisible Living World: Beyond Our Naked Eye
- Next: Chapter 4: Electricity: Magnetic and Heating Effects
- Hindi medium: Class 8 Science Chapter 3 PDF in Hindi (Jigyasa)
- All Science chapters and the other Class 8 books: Class 8 NCERT books 2026-27
- All Class 1 to 12 NCERT Textbooks: NCERT Books PDF (Class 1–12)
FAQ
What is the difference between communicable and non-communicable diseases?
Communicable diseases are caused by pathogens and spread from person to person (like malaria, dengue or flu); non-communicable diseases (like diabetes) do not spread by infection.
What does Class 8 Science Chapter 3 say about staying healthy?
Eating a balanced diet low in excess oil and sugar, regular exercise and yoga, adequate sleep, safe water, handwashing and managing screen time.