Class 8 Science – Chapter 2
Microorganisms: Friend and Foe
Important Exam Questions

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🔹 Very Short Answer Questions (VSA)

1. What are microorganisms?
2. Name one disease caused by bacteria.
3. Which microorganism is used in making curd?
4. What is pasteurization?
5. Name the microorganism that causes malaria.
6. Which gas is released during fermentation?
7. Name one nitrogen-fixing bacterium.
8. Which microorganisms cause food spoilage?

🔹 Short Answer Questions (SA)

1. Why are some microorganisms called useful?
2. How do microorganisms help in increasing soil fertility?
3. What are antibiotics? Give one example.
4. How do communicable diseases spread?
5. What is food poisoning?
6. Explain the role of yeast in bread making.
7. What are preservatives? Give examples.

🔹 Long Answer Questions (LA)

1. Explain the classification of microorganisms with examples.
2. Describe the harmful effects of microorganisms on humans and plants.
3. Explain various methods of food preservation.
4. What are communicable diseases? Explain preventive measures.
5. Describe nitrogen fixation and its importance.

🔹 Case-Based / Application Questions

1. Why is milk boiled or pasteurized before use?
2. Why should food be kept covered?
3. How can we prevent the spread of malaria and dengue?

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