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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
Photosynthesis is a process in which plants
पर्याय
take in oxygen and give out carbon dioxide
take in carbon dioxide and give out oxygen
take in nitrogen and give out oxygen
none of the above
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उत्तर
take in carbon dioxide and give out oxygen
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संबंधित प्रश्न
How is greenhouse effect produced?
Give two uses of the following component present in air:
nitrogen
Fill in the blank
Air is a ______ of gases
Tick (√) the correct alternative from the choice given for the following statement.
Fuels which do not leave any residue on burning are
Answer in your own words.
What are the various constituents of air? Write their uses.
Water does not have a ______ but has definite ______ and ______.
Why is it said that-
Air is a homogeneous mixture of various gases.
How is light scattered by the air?
Match the following:
| 1. | Layer of air | a. | Hand fan |
| 2. | Electrical energy | b. | 21% |
| 3. | Nitrogen | c. | Windmill |
| 4. | Oxygen | d. | Atmosphere |
| 5. | Palm Trees | e. | 78% |
Paheli kept some water in a beaker for heating. She observed that tiny bubbles appeared before the water started to boil. She boiled the water for about 5 minutes and filled it in a bottle up to the brim and kept the bottle air tight till it cooled down to room temperature.
Do you think tiny bubbles will appear on heating the water taken out from the bottle? Justify your answer.
