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Air

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    About Air
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  • The earth is surrounded by a layer of air called the .................
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  • Air occupies ................. and has ................. .
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  • Air can exert pressure in ................. and ................. direction.
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  • The major constituents of air are .................
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  • During the process of photosynthesis, plants produce one of the constituents of air .................
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  • Dust and smoke cause ................. of air when present in excess.
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  • Air is not a pure substance; it is a ................. .
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  • Air is .................... and .................... .
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  • The layer of air around the earth upto few km is known as .................... .
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  • ..................... is required for burning.
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  • Moving air is known as ................... .
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  • Nitrogen is ..................... and oxygen is ..................... in air.
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  • Plant produces food and ................... during photosynthesis.
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