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प्रश्न
Observe the picture given in figure carefully and answer the following questions.
- What is covering the nose and mouth of the police man?
- Why is he putting a cover on his nose?
- Can you comment on air quality of the place shown in the figure?
संक्षेप में उत्तर
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उत्तर
- The policeman is wearing a mask to cover his nose and mouth.
- He puts a cover on his nose to protect himself from dirt and polluted air. A mask avoids exposure to the harmful exhaust of vehicles, thus prevents the harmful gases and dust particles entering our body.
- The given figure shows a polluted area where the air quality is not good. It is due to the smoke and harmful gases such as carbon monoxide and sulphur dioxide emitted by the automobiles along with dust particles present in the air.
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संबंधित प्रश्न
What are the causes of air pollution?
Name the main components of air.
State three uses of water vapour in the air.
Write down the composition of three main gases present in air by volume.
Fill in the blanks
Plants and animals maintain the balance of carbon ___________and _________ in the air.
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 |
List out the uses of carbon dioxide.
How do the roots of land plants get oxygen for breathing?
Which gas in the atmosphere is essential for respiration?
______ present in the air is needed for respiration.
