Topic Details (Notes format)

Why Do We Fall Ill?

Subject: General Science

Book: NCERT Science Class 9

Health is a state of complete physical, mental, and social well-being.
- **Types of Diseases**:
- Infectious diseases (caused by pathogens like bacteria, viruses).
- Non-infectious diseases (caused by lifestyle or genetic factors).
- **Prevention of Diseases**:
- Vaccination, hygiene, balanced diet.
- **Immunity**:
- The body’s defense mechanism against diseases.

**Possible Exam Questions:**
1. What is the difference between infectious and non-infectious diseases?
2. Explain how vaccines help prevent diseases.
3. How do bacteria and viruses cause diseases?
4. What is the role of immunity in disease prevention?
5. Discuss the impact of hygiene on public health.

Practice Questions

Which disease is caused by the deficiency of vitamin C?

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What is the chemical formula of water?

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What is the function of hemoglobin in the blood?

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Which acid is found in the human stomach?

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Which organelle is responsible for photosynthesis in plants?

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What is the SI unit of temperature?

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What is the approximate age of the Earth?

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What is the primary component of the Sun?

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What is the pH of pure water at 25°C?

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Which gas is most abundant in Earth’s atmosphere?

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