NCERT Solutions for Class 7 Science Chapter Water A precious resource
In this page we have NCERT Solutions for Class 7 Science Chapter Water A precious resource . Hope you like them and do not forget to like , social share
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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) T
(b) F
(c) F
(d) T
Question 2
Explain how groundwater is recharged? Answer
The rainwater and water from other sources such as rivers and ponds seeps through the soil and fills the empty spaces and cracks deep below the ground. The process of seeping of water into the ground is called infiltration. The infiltrated water then gets accumulated into deep aquifer under the ground
Question 3
There are ten tube wells in a lane of fifty houses. What could be the long term impact on the water table? Answer
The tube wells take the water from underground. So if people of all the fifty houses in the lane use the ten tube wells regularly, this will lead to exploitation of water resource present underground. In long term, the water level will go below and thus the depletion of water layer
Question 4
You have been asked to maintain a garden. How will you minimize the use of water? Answer
Water is necessary for Garden but water is also a precious resource so we need to use it wisely. I will use the technique of drip irrigation for minimizing the use of water in maintenance of garden. In this method, required amount water is supplied directly to the roots of the plants using narrow pipes thus preventing the loss of water.
Question 5
Explain the factors responsible for the depletion of water table. Answer
Factors responsible for the depletion of water level:
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) tube wells ,hand pumps.
(b) ice, water and vapour.
(c) aquifer.
(d) 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. Answer
(iv) of the world remains constant.
Question 9
Make a sketch showing groundwater and water table. Label it. Answer
