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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
Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
Dust particles help in the ________ of water vapour in air.
Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium
Solution of carbon dioxide in water is called _________ acid.
Write ‘True’ or ‘False’ in front of following statement.
The catalyst used in laboratory preparation of oxygen gas from hydrogen peroxide gas is magnesium oxide
Fill in the blank
Aquatic plants and animals use _________ in water.
The diagrams below represents an experiment to show the presence of a component of air.
- State why air is sucked from – outlet ‘B’ and not from outlet “A”
- State why the air is sucked ‘slowly’ from the outlet “B”
- State the observation seen after completion of the experiment.
- State the reason for the above observation seen.
- Name another component which if present in air as a pollutant would have given a similar observation
Name the following:
The component of air which is present more in industrial areas.
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll.
Which gas is essential for burning?
______ is used as a substitute for compressed air in tyres.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
A weather cock shows the ______ in which the air is moving at that place.
