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Q6. What are communicable diseases? Give two examples of such communicable
diseases.
Q7. How are pathogens transmitted by air? Give two examples of such diseases.
Q8. What are carriers? Give two examples with diseases.

Q9. (a) How is milk stored at home?
(b) Why does the milk coming in packets remaingoodfor some days?

Q10. (a) What is the significance of nitrogen fixation?
(b) State the name of two microbes helping in biological nitrogen fixation.
(c) Define nitrogen cycle and different steps associated with it.