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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 :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
Fill in the blanks :
_______ and ______ are the most common air pollutants.
Write ‘True’ or ‘False’ in front of following statement.
The trapping of solar heat energy in the earth’s atmosphere is called greenhouse effect.
Write fully balanced equation for the following :
Ca(OH)2 + CO2 →
Fill in the blanks
Oxygen is used in ___________the food to get _______.
The constituent of air that supports combustion is _____.
_______ can be seen moving in a beam of sunlight in a dark room.
How do the roots of land plants get oxygen for breathing?
Carbon dioxide gas is ______ in nature.
A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.
Mountaineers carry oxygen ______ with them, while climbing high mountains.
