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

What type of energy is stored in a stretched rubber band?

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What is the term for an organism that can make its own food?

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Which part of the cell is responsible for energy production?

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Which is the smallest bone in the human body?

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Which type of radiation has the shortest wavelength?

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Which planet is known as the "Red Planet"?

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Which part of the cell contains the genetic material?

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Which type of bond is present in sodium chloride?

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

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What is the primary source of energy for life on Earth?

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