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प्रश्न
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?
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उत्तर
- The policeman is wearing a mask to cover his nose and mouth.
- He puts a cover on his nose to protect himself from dirt and polluted air. A mask avoids exposure to the harmful exhaust of vehicles, thus prevents the harmful gases and dust particles entering our body.
- The given figure shows a polluted area where the air quality is not good. It is due to the smoke and harmful gases such as carbon monoxide and sulphur dioxide emitted by the automobiles along with dust particles present in the air.
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संबंधित प्रश्न
Answer the question put against the following constituents of air:
Nitrogen : Explain its significance for plants and animals.
Name the main components of air.
Give reason:
A burning candle stops burning if covered with a glass tumbler
Fill in the blank
Green plants need ________________to prepare food.
Complete the statement given below by filling in the blank with the correct word from the words given:
The component of air used in photosynthesis is ______ and the products of photosynthesis is oxygen.
Of the total volume of air – 4/5th is nitrogen. State the utility or consequence of this ratio.
Can you guess why fire extinguishers throw a stream of carbon-di-oxide while putting - off the fire?
During respiration, carbon-di-oxide is exhaled out of the body through the ______.
______ is necessary for all acids.
Nitrogen gas is so cold that moisture in the air condenses on it, creating a dense fog.
