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

What is the unit of electric current?

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Which organ is responsible for detoxifying harmful substances in the human body?

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Which process in plants is responsible for the loss of water vapor?

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Which process separates light into its component colors?

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Which gas is released during photosynthesis?

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What is the unit of electrical resistance?

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What is the chemical symbol for the element iron?

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What is the most abundant gas in the Sun?

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What is the chemical formula of methane?

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What type of electromagnetic radiation has the longest wavelength?

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