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प्रश्न
Tick (√) the most appropriate answer.
The presence of water vapour in air is essential for :
विकल्प
health and comfort of animals
rate of evaporation from plants and animals
growth of plants
all the above
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उत्तर
all the above
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संबंधित प्रश्न
Write fully balanced equation for the following :
Ca(OH)2 + CO2 →
Name the following:
An inert gas which has a low boiling point and is used for producing very low temperatures
Why is air considered as a mixture?
What happens if the percentage of carbon-dioxide increases in the air?
Why is carbon-dioxide gas used to extinguish fire?
List uses of oxygen.
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.
Solvay process is a method to manufacture
Explain carbon dioxide and its uses.
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?
