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प्रश्न
Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere.
Nitrogen
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उत्तर
Nitrogen constitutes a major part i.e.78% of the atmosphere. Nitrogen is a gas that hinders burning. So, if nitrogen disappeared completely from the earth, things will burn at a faster rate. Also, in the lack of nitrogen, there are increased chances of dehydration. Nitrogen is a necessity for the growth of plants. Although plants do not absorb nitrogen directly through the air they consume it insoluble forms. So, no nitrogen will disturb the plant cycle.
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संबंधित प्रश्न
“Air is a mixture”. Support this statement citing at least three evidences.
Suggest five measures to prevent air pollution.
Write ‘True’ or ‘False’ in front of following statement.
The trapping of solar heat energy in the earth’s atmosphere is called greenhouse effect.
Tick (√) the most appropriate answer.
The humans pollute the air by :
Briefly state the importance of Carbon dioxide.
Give reason:
Mountaineers and divers carry oxygen cylinders with them.
Fill in the blank
The reddish-brown powder on the surface of iron nails exposed to air and moisture is called _____.
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 |
All living things use oxygen for breathing.
Assertion: Carbon dioxide occurs as carbonates in nature.
Reason: Carbon dioxide can exist as a liquid at atmospheric pressure.
