Water A Precious Resource
Q.1. Mark ‘T’ if the statement is
true and ‘F’ if it is false:
(a) The freshwater stored in the ground is much more than that present
in the rivers and lakes of the world. (T/F)
(b) Water shortage is a problem faced only by people living in rural
areas. (T/F)
(c) Water from rivers is the only source for irrigation in the fields.
(T/F)
(d) Rain is the ultimate source of water. (T/F)
Ans. (a) T (b) F (c) F (d) T
Q.2. Explain how groundwater is
recharged.
Ans. The groundwater gets recharged through the process of
infiltration. Infiltration means seeping of water from rivers and lakes into
the empty spaces and cracks deep below the ground.
Q.3.There are ten tubewells in a lane
of fifty houses. What could be the long-term impact on the water table?
Ans.The effect on the water table depends on the replenishment
of underground water. Only five families will share a tubewell, the water used
for daily domestic purposes will not effect the water table. But if there is
shortage of rains, the water used by the family will not replenished and water
table will fall down.
Q.4.You have been asked to maintain a
garden. How will you minimise the use of water? „
Ans.To minimise the wastage of water we will use the drip
irrigation which throws the water at the base of plants. We will check the
leakages in the water pipes and arrange small pits for rainwater harvesting.
The collected rainwater will be used later.
Q.5.Explain the factors responsible
for the depletion of water table.
Ans.Various factors responsible for the depletion of water
table are:
(i) Increased population: Demand of water has been increased by the increased
population. As the number of humans increase, the consumption of water also
increases.
(ii) Increasing industries: All industries need water. As the number of human
population increase, the number of industries are also increased which
definitely increases the consumption of water.
(iii) Lack of water conservation techniques: Main source of water on earth and
for the underground water is rain. The water of the rain, if conserved can
increase the ground water level. But this is not done due to lack of water
conservative techniques.
(iv) Agricultural activities: India is a country which depends on agriculture.
The land used for cultivation has increased. So, the consumption of water for
agriculture has increased. Irregular rainfall has increased the consumption of
groundwater. This has increased the depletion of groundwater.
Q.6.Fill in the blanks with the
appropriate answers: .
(a) People obtain groundwater through and .
(b) Three forms of water are solid, and .
(c) The water bearing layer of the earth is .
(d) The process of water seepage into the ground is called .
Ans.(a) wells, hand pumps
(b) liquid, gas
(c) aquifer
(d) infiltration
Q.7.Which one of the following is not
responsible for water shortage?
(i) Rapid growth of industries
(ii) Increasing population
(iii) Heavy rainfall
(iv) Mismanagement of water resources
Ans.(iii) heavy rainfall
Q.8.Choose the correct option. The
total water
(i) in the lakes and rivers of the world remains constant.
(ii) under the ground remains constant.
(iii) in the seas’and oceans of the world remains constant.
(iv) of the world remains constant.
Ans.(iv) of the world remains constant.
Q.9.Make a sketch shoyving
groundwater and water table. Label it.
Ans
