1. Fill in the blanks

a) Combustion is helped by .................
b) All living things require .................
to survive
c) Percentage of Nitrogen in air is ..............
d) Plants require the gas called ............. to photosynthesize.
e) The ............... are rotated by wind and used to draw underground water.
f) The air helps in dispersal of
.................. and ..................
g) Air acts as a medium for transmission of ..................
2. Give one word answer for the following:

a) The blanket of air surrounding the earth.
b) The process by which plants release water vapour in the atmosphere.
c) The process by which both plants and animals get energy from food.
d) Air in motion
e) A gas present in the form of layer in the upper atmosphere that protects us from the harmful Ultra Violet rays.
f) We cannot see it but we can feel it when it moves.

3. Answer in short:

a) What is the function of atmosphere?
b) How is Oxygen in the air replaced?
c) How do fishes breathe?

Dear Student, Q3.) (a) 1. Atmosphere has the oxygen that we need to breathe. 2).The atmosphere filters the Sun’s rays. If there were no atmosphere, the Sun would burn us more. 3). Atmosphere blocks some of the Sun's dangerous rays from reaching Earth. It traps heat, making Earth a comfortable temperature. And the oxygen within our atmosphere is essential for life. 4).One of the most important benefits the atmosphere provides is maintaining the Earth's temperature. (b) Green plants release oxygen during the process of photosynthesis which is then inhaled by animals for respiration. This continuous replacement of atmospheric oxygen also balances its amount in the air. (c) Fish have gills, with the help of which they breathe in the oxygen present in water. The water containing the dissolved oxygen passes through the gills and the oxygen gets absorbed by the gills. kindly ask the other questions in a separate thread. Regards

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