NCERT Solutions for class 7 science chapter 16

Water: A Precious Resource

NCERT Solutions for Class 7 Science chapter 16 Exercise Question

Question 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)

Answer

a) True

b) False

c) False

d) True

Question 2

Explain how groundwater is recharged.

Answer

The groundwater gets recharged by rainwater ,river and other source seeping of water into the empty spaces and cracks deep below the ground.

Question 3

There are ten tubewells in a lane of fifty houses. What could be the long-term impact on the water table?

Answer

If ten tubewells in a lane of fifty houses then they use water for thier domestic purpose if this happen for long time then level of groundwater get down table

Question 4

You have been asked to maintain a garden. How will you minimise the use of water? „

Answer

we can use different method of irrigation in water like drip irrigation method. In this method,We can supplied water directly to the root of the plants using pipes

Question 5

Explain the factors responsible for the depletion of water table.

Answer

Various factors responsible for the depletion of water table a are follow:
(i) Increased population: As population increased day by day the consumption of water also increases because water is basic need for every people for domestic perpose.
(ii) Increasing industries: To incerease the production more and more industries setup so the consumption of water also increases for theire use .
(iii) Agricultural activities: As demand of food increase due to increase of population, to fulfill the demand ,agricultural require wtaer for irrigation to the field for crop.

Question 6

Fill in the blanks with the appropriate answers: .
(a) People obtain groundwater through________ and _________ .
(b) Three forms of water are_______ , _________ and ________.
(c) The water bearing layer of the earth is ________.
(d) The process of water seepage into the ground is called ________-.

Answer

(a) People obtain groundwater through wells and hand pumps .
(b) Three forms of water are Solid , liquid and gas .
(c) The water bearing layer of the earth is Hydrosphere .
(d) The process of water seepage into the ground is called infiltration .

Question 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

Answer

(iii) heavy rainfall

Question 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.