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प्रश्न
Name and briefly explain four ways by which pollution of air is caused by humans.
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उत्तर
Pollution of air is caused by humans in the following ways :
- Large amount of coal burnt in thermal plants throw out huge amounts of smoke and ash in the atmosphere.
- Vehicles using petrol or diesel give out a lot of smoke and harmful gases like carbon-dioxide, lead, carbon- monoxide.
- Burning of garbage causes a lot of pollution due to the formation of carbon-monoxide, sulphur dioxide and nitrogen dioxide.
- Pesticides spread in the fields also cause air pollution.
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संबंधित प्रश्न
Answer the question put against the following constituents of air:
Nitrogen : Explain its significance for plants and animals.
State three uses of water vapour in the air.
Briefly state the importance of Carbon dioxide.
Write fully balanced equation for the following :
Ca(OH)2 + CO2 →
Give reason:
Aquatic animals and plants are able to survive in the matter.
Fill in the blank
Green plants need ________________to prepare food.
Fill in the blank
The reddish-brown powder on the surface of iron nails exposed to air and moisture is called _____.
______ is the percentage of nitrogen in air.
Match the following
| 1. | Oxygen | a. | Carbon dioxide |
| 2. | Azote | b. | Nitrogen |
| 3. | Solvay process | c. | Vital life |
| 4. | Gun powder | d. | No life |
Mountaineers carry oxygen cylinders with them because ______.
