Chapter 16


Water: An invaluable resource 

Exercises

1. 1. Mark the statement with ( c ) if it is true and ( m ) if it is false. 

(a) The amount of fresh water stored underground is much greater than that in the rivers and lakes of the Earth.

Answer: - S.

(b) People living in rural areas suffer from water shortage. 

Answer: Mr.

(c) The only source of irrigation in the fields is river water 

Answer: Mr

(d) Rainfall is the main source of water.

Answer: - S.

2. 2. Explain how groundwater is filled.

Answer: After the water is extracted from the ground, the vacant space is again flowed through the soil by rainwater. Similarly, water from rivers and ponds flows underground and fills the voids and gaps in the depths below.

3. 3. 3. There are ten sewers in fifty households.  What are the long-term impacts on groundwater levels?

Answer: If water is used more, the amount of water will decrease day by day. Lack of water will cause disruption among people. This will cause the groundwater to go to a great depth and cause water shortage in the area.

 4. The You are asked to manage a garden. How will you manage using less water? 

Answer: Instead of throwing away the water after washing the vegetables or other household items, it can be applied to the roots of flowers or flower seedlings in pots. This can also reduce water use.

5. 5. Explain the factors responsible for groundwater level decline. 

Answer: Water level decline can be caused by many factors like population growth, industrial and agricultural activities are common factors affecting groundwater level. Groundwater surface degradation can occur even with low rainfall. Another specific factor that can cause groundwater level decline is deforestation and lack of permeable soil.

6. 6. Fill in the blanks with the appropriate answer: 

(a)  People get groundwater by fire and manual .

(b) The three forms of water are solid, liquid   and  gaseous  

(c) The water-carrying layer of the Earth is the aquifer .

(d) The process by which water flows into the ground is called inter-dilution .

7. 7. Which of the following is not a cause of water shortage?

(a) Rapid growth of industry.

(b) Population growth.

(c) Heavy rainfall.

(d) Lack of good management of water resources.

Answer: Heavy rainfall.

8. 8. Choose the correct answer. 

The total water content remains the same -

(a) In the lakes and rivers of the Earth.

(b) Underground. 

(c) In the seas and oceans of the Earth. 

(d) The whole world.

Answer: In the lakes and rivers of the world.