Topic Details (Notes format)

Microorganisms: Friend and Foe

Subject: General Science

Book: NCERT Science Class 8

Microorganisms are tiny living organisms that cannot be seen with the naked eye. They include bacteria, viruses, fungi, and protozoa.
- **Useful Microorganisms**:
- Bacteria help in making curd and nitrogen fixation.
- Yeast is used in baking and fermentation.
- **Harmful Microorganisms**:
- Some bacteria and viruses cause diseases like tuberculosis and COVID-19.
- Fungi like bread mold spoil food.

**Possible Exam Questions:**
1. What are microorganisms? Classify them with examples.
2. How are bacteria useful in everyday life?
3. What are the harmful effects of microorganisms?
4. Discuss the role of vaccines in disease prevention.
5. How does yeast help in making bread and alcohol?

Practice Questions

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What is the primary component of the Sun?

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Which element is the most abundant in the Earth’s crust?

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What is the chemical formula of methane?

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Which of the following is a fundamental force in nature?

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What is the most abundant element in the universe?

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What is the SI unit of temperature?

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What is the chemical name of table salt?

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