NCERT Solutions for class 7 Science Chapter-16  Water: A

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NCERT Solutions for  class 7 Science Chapter-16

Chapter – 16      Water: A Precious Resource

Chapter Exercise

Page no. – (203)

 

Q.1– Mark ‘T’ if the statement is true and ‘F’ if it is false:-

  1. T

pter Exercise

Page no. – (203)

 

Q.1– Mark ‘T’ if the statement is true and ‘F’ if it is false:-

  1. The freshwater stored in the ground is much more than that present in the rivers and lakes of the world. (T/ F)
  2. Water shortage is a problem faced only by people living in rural areas. (T/ F)
  3. Water from rivers is the only source for irrigation in the fields. (T/ F)
  4. Rain is the ultimate source of water. (T/ F)

 

Ans.1–

  1. True.
  2. False.
  3. False.
  4. True.

 

 

Q.2– Explain how groundwater is recharged?

 

Ans.2– The groundwater gets recharged by the process of infiltration. In this process infiltration, the rain water and from the other source of water though the soil and fills 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.3– The much number of tubewells like ten tubewells in a lane of fifty houses will lead to inanity the groundwater table and at the time of rain shortage, water table would go – down.

 

 

Q.4– You have been asked to maintain a garden. How will you minimize the use of water.

 

Ans.4– The following step I take for minimize the use of water for to maintain a garden:-

  • Will use rainwater harvesting system.
  • Will Using Adopting drip irrigation method.

 

 

Q.5– Explain the factory responsible for the depletion of water table.

 

Ans.5– The following are the various factors responsible for the depletion of water table:-

  • Increasing population:- The Increasing of people, increase the demand of the water. So, Increasing population reduced the water table.
  • Increasing industries:– Industries require a lot of water to produce and manufacture their produce.
  • Lack of knowledge:– Waste of water is the biggest mistake caused by lack of knowledge.

 

 

Q.6– Fill in the blanks with the appropriate answer:-

  1. People obtain groundwater through ____ and ____.
  2. Three forms of water are ____, ____ and ____.
  3. The water bearing layer of earth is ____.
  4. The process of water seepage into the ground is called ____.

 

Ans.6–

  1. People obtain groundwater through __tubewells__ and __hand pump__.
  2. Three forms of water are __ice__, __water__ and __vapour__.
  3. The water bearing layer of earth is __hydroshere__.
  4. The process of water seepage into the ground is called __infiltration__.

 

 

Q.7– Which one of the following is not responsible for water shortage?

  1. Rapid growth of industries.
  2. Increase population.

iii. Heavy rainfull.

  1. Mismanagement of water resources.

 

Ans.7– iii. Increase population.

 

 

Q.8– Choose the correct option. The total water

  1. In the lakes and rivers of the worth remains constant.
  2. Under the ground remains constant.

iii. In the seas and oceans of the world remains constant.

  1. Of the world remains constant.

 

Ans.8– iv. Of the world remains constant.

 

 

Q.9– Make a sketch showing groundwater and water table. Label it.

 

Ans.9–

Fig. 16.4 Groundwater and water table

 NCERT Solution class 7 Mathematics EXERCISE- 7.2