Air

Dust and smoke cause ................. of air when present in excess.

Air occupies ................. and has ................. .

During the process of photosynthesis, plants produce one of the constituents of air .................

Plant produces food and ................... during photosynthesis.

Air can exert pressure in ................. and ................. direction.

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 ................. .

Nitrogen is ..................... and oxygen is ..................... in air.

The major constituents of air are .................

..................... is required for burning.

Moving air is known as ................... .

The earth is surrounded by a layer of air called the .................