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प्रश्न
Tick (√) the most appropriate answer.
The presence of water vapour in air is essential for :
पर्याय
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
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.
Statement given below is incorrect. Write the correct statement :
Helium gas at low pressure is used for filling electric bulbs.
Define the following:
Combustion.
Complete the statement given below by filling in the blank with the correct word from the words given below
The ______ is a layer which extends up to about 10-50 km. above the earth.
Tabulate the various components of air, including the components with variable composition.
What is the source of carbon dioxide in air?
The main component of air is oxygen.
Nitrogen is about two times more soluble in water than oxygen.
Write the reaction of carbon dioxide with lime water.
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?
