Water Pollution As Resource Management
Water Pollution As Resource Management
Water Pollution: Water free from harmful impurities and fit for drinking is called pure or fresh water. It is essentially required by all living organisms to carry out their various activities. But, the unrestricted and reckless activities of man make water dirty and unfit for drinking. The impure and dirty water is called ‘polluted water’.
1. Waste water from factories: Waste water released from factories contains several harmful chemicals. These chemicals are used in factories for making paints, detergents, etc. This waste water goes into rivers and lakes. The chemicals present in it destroy aquatic plants and animals. They are highly toxic and dangerous to human beings
2. Use of pesticides and fertilizers: A number of fertilizers and pesticides are freely used by farmers to increase their agricultural yield. These substances are poisonous. The contaminated water may then get into the bodies of animals causing several types of diseases.
3. Sewage disposal: Sewage coming out from towns and cities are dumped into rivers. Domestic and animal sewage helps the aquatic weeds to grow fast. The unrestricted growth of weeds makes water deficient in dissolved oxygen. So, aquatic life which uses dissolved oxygen is badly affected.
4. Change in temperature: In a dam, the temperature of water deep within is lower than that on the surface. When water is released from dams, there is a sudden change in temperature of water in the river. The change in temperature of river water is also caused by hot water released from industries. This affects the life forms present in water badly because they are used to live within a certain temperature range only. The eggs and larvae of several animals perish under such a sudden change in temperature
How to curb Water Pollution?
1. Sewage should not be released directly into rivers or lakes. They should be properly treated in sewage treatment plants.
2. Harmful chemicals should not be dumped into water bodies. They should be transformed into some useful substances.
3. Pesticides and fertilizers should be used only in a restricted manner.
Out of the following select those that would help to reduce water pollution
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| Right Option : C | |||
| View Explanation | |||
What are the examples of water pollutants ? | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) Sewage should not be released directly into rivers or lakes. They should be properly treated in sewage treatment plants. (b) Harmful chemicals should not be dumped into water bodies. They should be transformed into some useful substances. | |||
| Right Option : C | |||
| View Explanation | |||
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