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प्रश्न
Name and briefly explain four ways by which pollution of air caused by humans is minimised.
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उत्तर
Pollution of air by humans can be minimised in the following manner :
- In the thermal power plants, steel plants etc., electric precipitators should be used to reduce the smoke and ash entering the air.
- Efficient internal combustion engines should be used in vehicles.
- Improved chulha or stoves should be used to minimise the production of smoke and carbon-monoxide.
- We must grow more trees as they absorb harmful gases.
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संबंधित प्रश्न
Describe a simple experiment to show that l/5th of air is oxygen.
Statement given below is incorrect. Write the correct statement :
Symbiotic bacteria are present in nodules of cereal plants such as wheat.
Tick (√) the most appropriate answer.
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Give a reason why water droplets appear on the outer surface of a tumbler containing ice.
Match the statements in List 1 with the correct answers in List 2
| List 1 | List 2 | ||
| 1 | An impurity in air | A | Water vapour |
| 2 | The component of air which supports combustion | B | Respiration |
| 3 | The inert component in the air slightly soluble in water | C | Rare gases |
| 4 | The component of air which minimizes the rate of evaporation | D | Sulphur dioxide |
| 5 | The process which involves oxidation of food substance in living organisms | E | Helium |
| 6 | The component of air which finds application in observation balloons | F | Carbon dioxide |
| 7 | The process which involves oxidation of substances, liberating heat and light energy | G | Combustion |
| 8 | The component of air which is heavier than air and fairly soluble in water | H | Nitrogen |
| 9 | The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates | I | Photosynthesis |
| 10 | The component of air which is lighter than air and less than 1% in air | J | Oxygen |
Compare respiration and combustion-both involving oxygen of the air.
Carbon dioxide with water changes
Which gas in the atmosphere is essential for respiration?
Composition of the component of air ______ from place to place.
The composition of air changes slightly from place to place. Give examples.
