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