Last updated on June 26th, 2023 at 10:43 pm
| Group ‘A’ | Group ‘B’ |
| (1) Carbon dioxide | (a) Generation of soil |
| (2) Oxygen | (b) Rain |
| (3) Water vapour | (c) Plants and food production |
| (4) Microbes | (d) Combustion |
Name the following.
Constituents of the biosphere
This includes the atmosphere, the hydrosphere, the lithosphere, and every living organism on earth.
Biotic constituents of soil
Plant roots, microbes, worms, insects, burrowing rodents like rats.
Fossil fuel
The raw material for kerosene, petrol, diesel, paraffin wax, and tar.
Inert gases in air
neon, argon, helium, krypton, and xenon.
Gases that are harmful to the ozone layer
Chlorofluorocarbon and carbon tetrachloride.
True or false?
(a) Land and soil are the same thing. False
(b) The water in a lake is called ground water. False
(c) It takes about 1000 years to form a 25 cm thick layer of soil.False
(d) Radon is used in decorative lights. False
