WATER: A PRECIOUS RESOURCE (PART-1) class 7

 WATER: A PRECIOUS RESOURCE

Q.1. Fill the blanks: 

a) The process of seeping water into the ground is called ______________.

b) The seeped water is collected between the layer of hard rock. This is called ______________.

c) Sources of drinking water in India are _______and ______________.

d)  Every year, ______________ is celebrated as World Water Day. 

e) Rain, hail and snow that fall on ground are termed as ______________.

f) Constant circulation of water on the earth is known as ______________.

g) The hand pumps and ______________ are inserted at aquifer to get water. 

Ans. a) infiltration

        b) aquifer

        c) rivers, lakes

        d) 22 March

         e) Precipitation

        f) water cycle.

        g) tube wells

Q.2. Multiple choice questions:

i) Nearly 71% of earth's surface is covered with: 

a) Air 

b) Water .

c) Soil 

d) Ice

Ans. b) water 

ii) Where is maximum salinity in water found? 

a) Sea 

b) Surface Water 

c) Ground Water 

d) Well Water 

Ans. a) Sea

iii) Clouds contain: 

a) Water vapour 

b) Dust 

c) Smoke 

d) All of these

Ans. a) Water vapour

 

iv) Plants give out water in the form of: 

a) Transpiration 

b) Respiration 

c) Digestion 

d)Reproduction 

Ans. a) Transpiration 

 

v) Step well is also called: 

a) dam 

b) bawri

c) well 

d) tube well

Ans. b) bawri

  

vi) The upper limit of ground water is: 

a) ground level 

b) water level

c) ground table 

d) water table

Ans. d) water table

 

vii) Rain water harvesting is a method to: 

a) store rain water in tanks 

b) use rain water for irrigation 

c) recharge ground water

d) both (a) and (c) 

Ans. d) both (a) and (c) 

viii) In drip irrigation, water pipes are directed towards the: 

a) shoot of a plant 

b) root of a plant 

c) whole plant 

d) none of these

Ans. b) root of a plant  

Q.3. Which year was observed as the International Year of Freshwater and why?

Ans. Year 2003 was observed as the International Year of Freshwater to make people aware of this dwindling natural resource. 

Q.4. Water can be found in all the three forms, when it gets circulated through the water cycle. Explain the statement. 

Ans. when water circulates through the water cycle it can be found in all the three forms, i.e., solid, liquid and gas—at any given time somewhere on the earth.

The solid form: Snow and ice, is present as ice caps at the poles of the earth, snow-covered mountains and glaciers.

Liquid water: Liquid is present in oceans, lakes, rivers, and even underground.

The gaseous: Gaseous form is the water vapour present in the air around us.

The continuous cycling of water among its three forms keeps the total amount of water on the earth constant even when the whole world is using it.