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प्रश्न
State two similarities and two differences between respiration and burning.
उत्तर
Similarities:
Burning
- Oxygen is needed to combine with carbon and hydrogen in compound.
- .CO2 and H2O are formed with release of energy.
Respiration
- Oxygen is needed to combine with C and H2 of food.
- CO2 and H2O are formed with release of energy.
Differences:
Burning
- It occurs at higher temperatures.
- It is a fast process.
- A natural and continuous process.
Respiration
- It occurs at body temperature.
- It is a slow process.
- An artificial & discontinuous process.
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संबंधित प्रश्न
Match the following :
| Column A | Column B |
| (a) Global warming | 1. Hydrated ferric oxide |
| (b) Acid rain | 2. Manganese dioxide |
| (c) Rust | 3. Carbon dioxide |
| (d) Catalyst | 4. Methane |
| (e) Photosynthesis | 5. Nitrogen Dioxide |
Fill in the blank:
_____________ discovered the oxygen gas.
Define rusting?
Tick (√) the correct alternative from the choice given for the following statement.
Respiration
What is meant by the term ‘atmosphere’? State the role played by the atmosphere for the survival of mankind.
Answer in your own words.
What are the various constituents of air? Write their uses.
Water does not have a ______ but has definite ______ and ______.
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. The constituent of air which is around 0.02% | A: Nitrogen |
| 2. The constituent of air which is inert or unreactive | B: Oxygen |
| 3. The constituent of air which is non-combustible, but supports combustion. |
C: Sulphur dioxide |
| 4. A pollutant in air responsible for acid rain | D: Carbon dioxide |
| 5. The main rare gas present in air. | E: Argon |
The process of conversion of iron into hydrated form of oxides is called _______.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement
Air is a ______ of some gases.
