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Pollution of Air & Water, Chapter Notes, Class 8, Science PDF Download

8th Pollution Of Air And Water (CBSE Science)

 
Pollution of Air & Water, Chapter Notes, Class 8, Science
 
 
Pollution of Air & Water, Chapter Notes, Class 8, Science
Water pollution: The contamination of water that changes in the physical, chemical and biological conditions of water is called water pollution. This makes water unfit for human consumption.
Whenever harmful substances such  as sewage, toxic chemicals, silt, etc., get  mixed with water, the water becomes  polluted. 
The substances that pollute  water are called water pollutants.
1.Many industries discharge harmful chemicals into rivers and streams, causing the pollution of water.
2.Use of pesticides and weedicides . These chemicals dissolve in water and are washed into water bodies from the fields. They also seep into the ground to pollute ground water.
3. The bacteria present in the faeces of mammals.
4. Throwing  untreated sewage directly into rivers.
Water which is suitable for drinking is called potable water.
water can be made safe for drinking:
1. By filtering water. A popular household filter is a candle type filter.
2. By boiling Water.Boiling kills the germs present in the water
3. Chlorination is a commonly used chemical method for purifying water.It is done by adding chlorine tablets or bleaching powder to the water
WHAT YOU HAVE LEARNT
  1. Water pollution is the contamination of water by substances harmful to life.
  2. Sewage, agricultural chemicals and industrial waste are some of the major contaminants of water.
  3. Water which is purified and fit for drinking is known as potable water.
  4. Water is a precious natural resource. We must learn to conserve it.

 

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FAQs on Pollution of Air & Water, Chapter Notes, Class 8, Science

1. What are the main sources of air pollution?
Ans. The main sources of air pollution include industrial emissions, vehicle exhaust, burning of fossil fuels, agricultural activities, and waste disposal.
2. How does air pollution affect human health?
Ans. Air pollution can have severe negative effects on human health. It can cause respiratory problems, such as asthma and bronchitis, as well as allergies and irritation of the eyes, nose, and throat. Prolonged exposure to air pollution can also increase the risk of heart disease, lung cancer, and other chronic illnesses.
3. What are the consequences of water pollution?
Ans. Water pollution can have various consequences on both human and aquatic life. It can contaminate drinking water sources and lead to the spread of waterborne diseases. Pollution in water bodies can also harm aquatic plants and animals, causing a disruption in ecosystems and reducing biodiversity.
4. How can we prevent air pollution?
Ans. There are several ways to prevent air pollution. Some measures include using cleaner and renewable sources of energy, such as solar and wind power, reducing the use of fossil fuels, promoting public transportation, implementing stricter emission standards for industries and vehicles, and practicing proper waste management.
5. What are the major causes of water pollution?
Ans. The major causes of water pollution include industrial waste discharge, agricultural runoff containing pesticides and fertilizers, improper waste disposal, oil spills, sewage and wastewater discharge, and littering. These activities introduce harmful substances into water bodies, leading to pollution.
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