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प्रश्न
Why is it said that water is life?
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उत्तर
Water is one of the most precious resources that we have on earth. All the biochemical processes that occur in plants and animals, our surroundings, etc. require water to function. It is required for the existence of life on earth, as it is an essential component of all the biological processes. We cannot imagine our lives without the presence of water.
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WOSN
Match the items of Column I with the items of Column II with reference to sewage.
| Column I | Column II | ||
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| (b) | Organic impurities | (ii) | nitrates and phosphates |
| (c) | Nutrients | (iii) | cholera and typhoid |
| (d) | Bacteria | (iv) | pesticides and herbicides |
