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प्रश्न
Arrange the following statements in correct sequence
- Plants manufacture food by a process called photosynthesis.
- Plants require energy for their growth.
- Plants take in oxygen and release carbon dioxide just as animals.
- Plants take carbon dioxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
- Such oxygen is available to animals and human beings for breathing.
- During this process, oxygen is released by plants.
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उत्तर
- Plants take in oxygen and release carbon dioxide just as animals.
- Plants require energy for their growth.
- Plants manufacture food by a process called photosynthesis.
- Plants take carbon dioxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
- During this process, oxygen is released by plants.
- Such oxygen is available to animals and human beings for breathing.
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संबंधित प्रश्न
Answer the question put against the following constituents of air :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
What is air pollution ? What are the harmful effects of sulphur dioxide, nitrogen dioxide and hydrogen sulphide present in the air ?
Name three noble gases present in the air. State their one industrial use
What do you observe when Ice cold water is filled in a glass tumbler.
Name the following:
The active component of air which supports combustion and is used up in burning
Tabulate the various components of air, including the components with variable composition.
Nitrogen gas is so cold that moisture in the air condenses on it, creating a dense fog.
Assertion: Carbon dioxide occurs as carbonates in nature.
Reason: Carbon dioxide can exist as a liquid at atmospheric pressure.
Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.
- Bubbles of air came out from the bottle.
- Some water entered the bottle.
- Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
- No bubbles formed, only water entered the bottle.
Which observations is/are correct?
Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere.
Oxygen
