(b) sewage treatment.
1. How are viruses different from other microorganisms?
2. List the different uses of microorganisms.
3. Describe the role of microorganisms in
(a) cleaning of the environment and
4. Write a short note on: (a) antibiotics and (b) vaccines.
5. Write a short paragraph on the role of microorganisms as sources of food.
6. How do microbes enter the human body?
7. How do you know that the food has been spoiled? Mention the indicators of spoilage of food.
8. Describe the different methods of food preservation.
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