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प्रश्न
Explain the following observations very briefly
Breathing through mouth may harm you.
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उत्तर
There are many dust particles, gases and water vapours present in the air that we breathe. When we inhale through nostrils, the entry of these harmful particles is prevented by the fine hair and mucus present in the nose as they filter the air but when we breathe through the mouth there’s no such filtering of particles. Thus, they enter our body, reach the respiratory tract and make us ill.
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संबंधित प्रश्न
Answer the question put against the following constituents of air :
Water vapours : Explain their role in modifying the earth’s climate.
State three uses of water vapour in the air.
Statement given below is incorrect. Write the correct statement :
Symbiotic bacteria are present in nodules of cereal plants such as wheat.
Tick (√) the most appropriate answer.
Symbiotic bacteria is not present in the nodules of :
Tick (√) the most appropriate answer.
Which is not a polluting gas for the air?
Briefly state the importance of Carbon dioxide.
Give reason:
A burning candle stops burning if covered with a glass tumbler
State the utility of oxygen for respiration in plants
Nitrogen is _______ than air.
Composition of the component of air ______ from place to place.
