16. Water : A Precious Resource Science class 7 in English Medium ncert book solutions Assignment

Additional Question with solution:

Que: Suggest one traditional way of storing water from ancient time.

Ans: In ancient times, people used to make Bawris to store water.

Que: The earth tooks blue from space. Explain why?

Ans: The major surface area (71%) of the earth is covered with water. This imparts blue colour to the earth.

Que: Reservoir of dam helps us to manage water. How?

Ans:  The reservoir of dam or river can release water at our will. We can divert the flow of water at desired places where it is really needed and we can manage water resource effectively.

Que: The excessive use of water leads to a severe problem. write the problem.

Ans: The excessive use of water leads to water scarcity in an area.

Que: How much of the earth's surface is covered with water?

Ans: About two - third of tyhe earth's surface is covered with water?

Que: Mention the year which is celebrated as international year of freshwater?

Ans: The year 2003 was celebrated as International year of freshwater.

Que: State the consequences, if plants do not get enough water.

Ans: The plants will wilt and ultimately dry up in lack of water.

Que: Mention the source of groundwater.

Ans: Rainwater and water from the other sources like rivers, ponds, etc are the source of froundwater.

Que: From where do the worker get water for construction?

Ans: Worker get water from the underground water.

Que: Can we keep on drawing water from under the ground? How will it affect the water table?

Ans: No, we cannot keep on drawing water.

It causes the depletion of water table.

Que: As our population increases, we need more water for drinking, washing and other purposes. Does this affect the water table? Explain?

Ans: Yes, rising population leads to an increase inconsumption and at the same time, a decrease in the seepage of water into the. ground leads to the depletion of watertable.