5th std EVS chapter 3 the earth and it's living world l question and answer l

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Environmental Studies -  5th Standard 

3. The Earth And Its Living World 

Question And Answer

 Q.1 Fill in the blanks.

1) The hydrosphere extends under the water also.

2) Rills are the smallest and rivers are biggest fresh water sources.

3) Huge blocks of ice floating in the sea are called icebergs.

4) Almost all the water vapour in the atmosphere is contained in the troposphere.

5) The layer of atmosphere which is next to troposphere is called stratosphere.

6) Many lakes and wells get water from springs.

7) Kangaroos are found only in Australia.

Q.2 In the following sentences, underline the words that refer to landforms.

1) Anil lives at the foot of a hill.

2) Ria lives in a plateau region.

Q.3 Give any two example of each.

1) Weather related events:-

Ans. 1) Formation of clouds 2) Rainfall 3) Fog 4) Winds 5) Storms.

2) Sources of water:-

Ans. 1) Rills and brooks 2) Streams 3) Wells and rivers 4) Lakes and ponds 5) Glaciers.

Q.4 Answer the following questions.

1) What are clouds made up of?

Ans. 1) Clouds are made up of fine droplets of water.

2) The sun’s heat evaporates the water to form vapours form the earth’s surface.

3) This water vapour rises high up in the atmosphere.

4) At cool heights, it condenses forming fine droplets of water which in turn make the clouds.

2) What is meant by ‘biosphere’?

Ans. 1) Living things are seen in all the envelopes of the earth such as lithosphere, hydrosphere and atmosphere.

2) All the living things together in these three envelopes form a biosphere. Thus, the plants, animals and microorganisms together make a biosphere.

Q.5 Write short notes on.

1) Evaporation:-

The heat changes water into vapour. The action is called evaporation. The sun’s heat convert the water present on the earth’s surface into water vapour. The water that has percolated into the soil also evaporates due to heat. All such vapour enters the atmosphere. This vapour condenses and comes in the form of rain back to the surface of the earth. Thus evaporation is necessary for rainfall. The water cycle keeps on functioning due to evaporation.

2) Condensation:-

Condensation is the process in which vapour is changed into water. In nature due to condensation, there is rainfall. The water vapour that reaches the upper layers of atmosphere, gets condensed and forms fine droplets of water.

3) Water Cycle:-

The movement of water is continuously taking place from earth’s surface to earth’s atmosphere. The process of evaporation, condensation and rainfall is a continuous process. Due to the sun’s heat, the water on the earth’s surface is continuously evaporated. Since the water vapour is lighter than air, it rises high in the atmosphere. Due to cool temperatures at the heights, the water vapour condenses forming fine droplets of water. These droplets later form clouds. When small droplets of water become heavier and bigger, they descend down on the earth in the form of rain. Rainwater mixes with different water bodies. The snowbound regions also show melting of ice and glaciers. This water also eventually mixes with ocean waters. In this way water moves in the cyclic manner, which is known as water cycle.

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