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प्रश्न
Observe the picture given in Fig. carefully and answer the following questions.
Why is he putting a cover on his nose?
उत्तर
The mask is protecting him from dirt, pollution and exhaust of vehicles which are harmful elements. If these enter his body, he can suffer from respiratory disorders.
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संबंधित प्रश्न
What are the two ways in which nitrogen fixation occurs?
Tick (√) the most appropriate answer.
A gas which dilutes the activity of oxygen in air is:
What do you observe when Ice cold water is filled in a glass tumbler.
Fill in the blanks
Plants and animals maintain the balance of carbon ___________and _________ in the air.
Name the following:
The main, rare (inert) gas present in air.
Name the following:
The component of air which does not support combustion.
_______ can be seen moving in a beam of sunlight in a dark room.
How do plants and animals maintain the balance of oxygen and carbon dioxide in the air?
The component of air used by green plants to make their food, is ______.
How to show the presence of carbon-di-oxide in the air?
