# NCERT Solutions for Class 7 Science Chapter 16

## Water: A Precious Resource Class 7

### Exercise : Solutions of Questions on Page Number : 203

Q1 :

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)

(a) The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T)

(b) Water shortage is a problem faced only by people living in rural areas. (F)

(c) Water from rivers is the only source for irrigation in the fields. (F)

(d) Rain is the ultimate source of water. (T)

Q2 :

Explain how groundwater is recharged.

Rain water and the water from water bodies on earth's surface pass through the soil by the process of infiltration. The infiltrated water then gets accumulated in the aquifer deep under the ground. There are some layers of impermeable rocks which prevent the water in the aquifer from seeping down further.

In this way, the ground water is recharged.

Q3 :

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

Q4 :

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

Q5 :

Explain the factors responsible for the depletion of water table.

Q6 :

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 ________.

Q7 :

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

Q8 :

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.