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प्रश्न
Name the processes which maintain the balance between oxygen and carbon dioxide in the air. How is it done?
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उत्तर
Respiration and combustion are the processes which maintain the balance between oxygen and CO2 in the air.
- Respiration: Respiration is a chemical process that takes place in all living beings. In this process, oxygen present in the inhaled air reacts with the digested food material in the body. This results in the release of energy, carbon dioxide, and water.
- Combustion: Burning or combustion is a process in which a substance reacts chemically with oxygen and gets oxidised, with the release of energy in the form of heat and light. It is a fast process. During the process of burning, along with energy, carbon dioxide, and water vapour are also produced.
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संबंधित प्रश्न
Match the statements in Column A, with those in Column B.
| Column A | Column B |
| 1. Largest Constituent of air, which dilutes the activity of oxygen. | (a) Oxygen |
| 2. A gas used for filling weather observeation balloons. | (b) Carbonic acid |
| 3. An acid formed by the dissolution of sulphur dioxide gas in water. | (c) Sulphuric acid |
| 4. An acid formed by the dissolution of carbon dioxide in water. | (d) Helium |
| 5. A gas vital for respiration. | (e) Nitrogen |
Write ‘True’ or ‘False’ in front of following statement.
Atmospheric nitrogen is directly absorbed by the plants to form plant proteins.
Discuss harmful effects of greenhouse effect.
Fill in the blank:
_____________ discovered the oxygen gas.
Why can’t we see air?
How is air useful to agriculture?
How is air useful to windmills?
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Air is a mixture and not a compound since the components of air cannot be separated by physical methods.
What will happen if the number of vehicles and factories in your surroundings increases?
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
The ______ makes the windmill rotate.
