Page 167 - Science Class 06
P. 167
cause harm to aqua c plants and AIR
animals.
Air is a basic need of all living beings.
v Small plants and organisms are also Human beings, animals and plants need air
swept away from the pond and lakes, to live. Aqua c plants and animals also need
Actually these small plants are eaten by air. There are many other uses of air.
other organisms. When these are lost, Let’s study about air, its composi on and its
many water animals cannot get food importance for living beings:
and die.
Air is a Mixture
Rainwater Harves ng
Air is a mixture of various gases and it
This is one of the most important methods surrounds the earth. The atmosphere which
of water conserva on. With the help of this envelopes the earth is also made up of air,
method, groundwater is recharged. which extends upto many kilometres (about
This involves the following ac vi es: 1000 kms) above the surface of the earth.
Rainwater is collected on the roofs of the Composi on of Air
buildings. This water is further discharged in Important cons tuents of air are nitrogen
pits through pipes. The water, gradually, (78.08%), oxygen, (20.94%), argon (0.93%),
percolates and reaches to the level of
carbon dioxide (0.033%) and neon, helium,
groundwater. In this way, groundwater is
methane, krypton, xenon, hydrogen and
recharged. ozone in very small amount.
Others 0.04%
Argon 0.93%
Oxygen 20.95%
Nitrogen
Oxygen
Argon
Others
Rainwater Harves ng
Nitrogen 78.08%
Composi on of Air
Why do Animals Need Air?
1. Write the causes of drought.
Animals need air mainly oxygen for
2. Write the effects of drought on soil. respira on. Respira on is the process in
3. Write the effects of drought on animals. which energy is released from the food.
4. What is flood and how does it occur?
The process of respira on is completed in
5. Flood is good as well as bad for the soil. two phases:
Comment.
v Breathing v Release of Energy
Science-6 167
