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प्रश्न
What is the composition of air?
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उत्तर
Air is a mixture of 79% nitrogen, 20% oxygen, 1% carbon dioxide, water vapours, and some other gases. Air also contains dust particles.
संबंधित प्रश्न
Fill in the blank
Green plants need ________________to prepare food.
You are given a test tube with two outlets and a bottle of lime water. Using same, how would you demonstrate experimentally the presence of carbon dioxide in air.
Give a reason why two different rare (inert) gases find application in advertisement signs and fluorescent bulbs.
Name three different appliances where air is utilized.
Name the following:
The component of air which does not support combustion.
Compare respiration and combustion-both involving oxygen of the air.
Arrange the following statements in correct sequence
- Plants manufacture food by a process called photosynthesis.
- Plants require energy for their growth.
- Plants take in oxygen and release carbon dioxide just as animals.
- Plants take carbon dioxide from the atmosphere, use chlorophyll in the presence of sunlight and prepare food.
- Such oxygen is available to animals and human beings for breathing.
- During this process, oxygen is released by plants.
The air in coastal areas have more oxygen.
The components of air which are harmful to living beings are ______.
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.
