Class 8 Science – Chapter 2
Microorganisms: Friend and Foe
Worksheet – Practice Questions

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A. Very Short Answer Questions

1. What are microorganisms?
2. Name one useful microorganism.
3. Which microorganism is used to make curd?
4. Name one disease caused by bacteria.
5. What is pasteurization?

B. Short Answer Questions

1. Why are microorganisms called both friends and foes?
2. How do microorganisms help in food production?
3. What are antibiotics? Why should they be used carefully?
4. Explain the role of Rhizobium bacteria.
5. How does food get spoiled?

C. Fill in the Blanks

1. Curd is formed by the action of __________.
2. Malaria is caused by __________.
3. Heating milk to kill germs is called __________.
4. ____________ bacteria fix nitrogen in soil.
5. Vaccines protect us from __________ diseases.

D. True or False

1. All microorganisms are harmful. (True / False)
2. Viruses can reproduce only inside a host. (True / False)
3. Antibiotics work against viral diseases. (True / False)
4. Yeast is used in baking bread. (True / False)
5. Preservation prevents food spoilage. (True / False)

E. Long Answer Questions

1. Explain different methods of food preservation.
2. Describe harmful effects of microorganisms with examples.
3. How do vaccines work in our body?

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