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प्रश्न
Match the following.
| Nitrogen | Respiration in living animals |
| Oxygen | Fertilizer |
| Carbon dioxide | Refrigerator |
| Dry ice | Fire extinguisher |
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उत्तर
| Nitrogen | Fertilizer |
| Oxygen | Respiration in living animals |
| Carbon dioxide | Fire extinguisher |
| Dry ice | Refrigerator |
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संबंधित प्रश्न
Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
Dust particles help in the ________ of water vapour in air.
Write ‘True’ or ‘False’ in front of following statement.
Water containing dissolved carbon dioxide can dissolve marble.
Name and briefly explain four ways by which pollution of air is caused by humans.
Fill in the blanks
Plants and animals maintain the balance of carbon ___________and _________ in the air.
Complete the statement given below by filling in the blank with the correct word from the words given:
The component of air used in photosynthesis is ______ and the products of photosynthesis is oxygen.
What happens if the percentage of oxygen in the air reaches to 70%?
What was the old name of nitrogen?
Oxygen is used to oxidize ______.
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?
On a Sunday morning Paheli’s friend visited her home. She wanted to see some flowering plants in the nearby garden. Both of them went to the garden. While returning from the garden they also observed some flowering plants on the road side. But to their surprise they found that the leaves and flowers of these roadside plants were comparatively very dull. Can you help them to know why?
