ANS VER THE FOLLOWING QUESTIONS
1. How does internal environment differ from external environment?
2. Give the common hazards of air pollution to man.
3. List measures to check the air pollution
4. What are the common sources of water in villages? Give characters of each water
source.
5. Define 'safe water'. Give its qualities.
6. How does hard water differ from soft water?
7. Explain poor housing hygiene in villages.
8. Enumerate the basic needs of a healthful housing.
9. Draw a labelled diagram of water-seal type of latrine.
10. Distinguish between a composit pit and a manure pit.
Answers
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Answer:
1, because our house or bla-bla are covered total only there are windows where air or sunlight come or bla-bla come so its different
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