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(a) What is meant by water pollution? What are the different ways in which water gets polluted?
(b) State the harmful effects of water pollution.
(a) Harmful substances like sewage, toxic materials, silt etc., when get mixed with water, cause water pollution. The pollutants which cause water pollution are the chemical waste from industries, sewage, silt, agricultural chemicals and garbage thrown into the water.
Water gets polluted in the following ways:
- Water can be contaminated by human waste or sewage.
- Industries such as oil refineries, paper factories, textile and sugar mills and chemical factories discharge harmful chemicals into rivers and streams. These chemicals include arsenic, lead and fluoride.
- The chemicals such as arsenic, lead and fluorides discharged by the industries are very toxic to plants and animals.
- The hot water released by certain industries raises the temperature of the water body. It adversely affects the plants and animals living in it.
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- Effects of Water Pollution
- Name any four pollutants which cause water pollution. State any three ways of controlling water pollution.
- What are the different ways in which water becomes polluted by human beings ?
- What are the different ways in which water gets contaminated?
- What is meant by polluted water.
- What is Water Pollution?
- What are the causes of 'water pollution'? Discuss how you can contribute in reducing water pollution.
- What are the different ways in which air gets polluted?
- Select the correct statement regarding water pollution.(A) Suspended impurities make water more transparent causing death of submerged aquatic plants.(B) Polluted water can cause diseases.(C) Water pollution increases dissolved oxygen level of water.(D) Agricultural runoff pollutes water into it.
- What is meant by air pollution?
- What is meant by the conservation of water?
- What can be done to control water pollution?
- What is meant by water table?
- Read the paragraph and answer the questions following it.Water is essential for life. Without water there would be no life. We usually take water as granted for its purity, but we must ensure the quality of water. Pollution of water originates from human activities. Through different paths, pollution reaches to groundwater. Easily identified source or place of pollution is called as point source, e.g. municipal and industrial discharge pipes, where pollutants enter the water source. Non-point sources of pollution are those where a source of pollution cannot be easily identified, e.g. agricultural run-off, acid rain, etc.(a) How do you classify the various sources of water pollution?(b) What are the point sources of water pollution?(c) Name any two non-point sources of water pollution?
- How do industries cause water pollution?
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