Class 8 Science – Chapter 2
Microorganisms: Friend and Foe
Important Exam Questions (VSA / SA / LA)
A. Very Short Answer Questions (1 Mark)
- What are microorganisms?
- Name one nitrogen-fixing bacterium.
- Which microorganism is used in making curd?
- What is vaccination?
- Name one disease caused by virus.
B. Short Answer Questions (2–3 Marks)
- How do microorganisms help in agriculture?
- What is pasteurisation? Why is it important?
- Why should antibiotics not be taken without medical advice?
- How do microorganisms spoil food?
- What are vaccines? How do they work?
C. Long Answer Questions (5 Marks)
- Explain the useful roles of microorganisms in our daily life.
- Describe different methods of food preservation with examples.
- How do microorganisms cause diseases? Write preventive measures.
- Explain nitrogen fixation and its importance for plants.
D. Case-Based / Application Questions
- Ravi fell ill after drinking unboiled milk. (a) Which microorganisms may be responsible? (b) How could this have been prevented?
- Why are vaccines given at an early age?
⭐ These questions are HIGHLY IMPORTANT for exams
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