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प्रश्न
Differentiate between the following:
Natural water and treated water
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उत्तर
Natural water and treated water :
- Natural water: Water obtained in nature, river water, lake water, seawater, snow, rainwater.
- Treated water: Water which has received some form of treatment – ice, mineral water, distilled water, water in the swimming pool.
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QUIFERA
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
| (a) | Inorganic impurities | (i) | phosphorus and nitrogen |
| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
Why is there a need for conserving water? Give two reasons.
