CLASS 8 Chapter 2 Microorganisms: Friends and Foe

Short Answer Type Questions

1. What are the major groups of microorganisms?
2. Name any two diseases caused by bacteria.
3. Name any two diseases caused by algae.
4. Name any two diseases caused by a virus.
5. Name any two diseases caused by protozoa.
6. Name any two diseases caused by fungi.
7. How are viruses different from other microorganisms?
8. Why is the yeast used for making bread, cakes and pastries in the baking industry?
9. Name the modes of transmission of communicable diseases.
10. Why are some microorganisms considered harmful?
11. How is food poisoning caused?
12. Define fermentation.
13. Discuss the preservation of food by heating.
14. Discuss the preservation of food by dehydration.
15. Define food poisoning. Discuss its various symptoms.
16. What is meant by nitrogen fixation?
17. Define antibiotics.

Long Answer Type Questions

1. Describe how is sugar converted to alcohol.
2. Draw and explain the Nitrogen Cycle.
3. What is a vaccine? How does it work?