Exercise class 6 Science chapter 1.Natural Resources - Air, Water and Land । Exercise class 6th

Exercise class 6 Science chapter 1.Natural Resources - Air, Water and Land, Exercise class 6th, Exercise natural resources air water and land, Exercise natural resources air, water and land, Exercise std 6 Science chapter 1, Std 6 natural resources air water and land,

Fill in the blanks.
(a) The layer of ozone gas absorbs
………… rays that come from the
sun to the earth.
(b) Of the total water available on
the earth, fresh water forms ......
percent.
(c) Both ...…. and ……... constituents
are present in the soil.
2. Why is it saidthat – ?
(a) The ozone layer is a protective
shell of the earth.
(b) Water is life.
(c) Seawater is useful even though it is
not potable.
3. What will happen if –
(a) Microbes in the soil get destroyed.
(b) The number of vehicles and
factories in your surroundings
increases.
(c) The total supply of potable water is
finished.
4. Match the following.
Group ‘A’
Group ‘B’
(1) Carbon
(a) Generation of
dioxide
soil
(2) Oxygen
(b) Rain
(3) Water
(c) Plants and
vapour
food production
(4) Microbes
(d) Combustion
Name the following.
(a) Constituents of the biosphere
(b) Biotic constituents of soil
(c) Fossil fuel
(d) Inert gases in air
(e) Gases that are harmful to
the ozone layer
6. True or false ?
(a) Land and soil are the same thing.
(b) The water in a lake is called ground
water.
(c) It takes about 1000 years to form a
25 cm thick layer of soil.
(d) Radon is used in decorative lights.
7. Answer in your own words.
(a) Explain with the help of a diagram
how soil is formed.
(b) Why is there a shortage of water
even though it occupies about 71%
of the earth’s surface ?
(c) What are the various constituents of
air ? Write their uses.
(d) Why are air, water and land
considered to be valuable natural
resources ?