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Q7. What are vaccines? How do vaccines work? Name two diseases that can be
prevented by vaccination.

Q8. (a) How do the antibiotics work?
(b) How are the antibiotics obtained? Give two examples of antibiotics.
(c) Are you going to take antibiotics for the common cold? Give reason to
support your opinion.

Q9. How does yeast help in baking bread?

Q10. Microorganisms form an integral part of the natural cleaning and recycling
system of the environment? Justify it.