NCERT Solutions for Class 7 Social Science Geography Chapter 5 Water

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Water NCERT Solutions for Class 7 Social Science Geography Chapter 5

Class 7 Geography Chapter 5 Water InText Questions and Answers

Text Book Page No. 33

Question 1.
Why water is important for us ?
Answer:
Water is important for us because

1. Maximum part of our body is made up of water.
2. It is essential for plants growth.
3. We use it for drinking. Without water the existence of plants, animals is not possible and this will create threat to human existence too.

Question 2.
Suggest three ways in which water can be conserved in your home and two ways in your school.
Answer:
Ways to conserve water at home :

1. Do not throw away water that has been used for washing vegetables, rice or dais. Use it to water plants or to clean the floors.
2. Avoid flushing of toilet unnecessarily.
3. When washing the car, use water from a bucket and not a hosepipe.

Ways to conserve water at school :

1. Replacement of old/leaking service pipes.
2. Regular checking of taps used for drinking water. Leaking taps should be immediately removed.

Class 7 Geography Chapter 5 Water Exercise Questions and Answers

Question 1.
Answer the following questions :
(1) What is precipitation?
Answer:
Precipitation is the deposition of moisture from the atmosphere onto the earth’s surface. This may be in the form of

1. Rain
2. Hail
3. Frost
4. Fog
5. Sleet
6. Snow

(2) What is water cycle?
Answer:
The process by which water continually changes its form and circulates between oceans, atmosphere and land is known as the water cycle.

(3) What are the factors affecting the height of the waves?
Answer:

• High-speed winds
• earthquake
• volcanic eruption
• underwater landslides

(4) Which factors affect the movement of ocean water?
Answer:

• Temperature
• Rotation of the earth

(5) What are tides and how are they caused?
Answer:
The rhythmic rise and fall of the ocean water twice a day is called tide.

• There are two types of tides—the high tide or the spring tide and the low tide or the neap tide.
• The strong gravitational pull exerted by the sun and the moon on the earth’s surface cause the tides.
• The water of the earth closer to the moon gets pulled under the influence of the moon’s gravitational pull that causes tides.

Question 2.
Tick the correct answer.
(1) The process by which water continually changes its form and circulates between oceans, atmosphere and land
(a) Water cycle
(b) Tides
(c) Ocean currents
Answer:
(a) Water cycle

(2) Generally the warm ocean currents originate near
(a) Poles
(b) Equator
(c) None of these
Answer:
(b) Equator

(3) The rhythmic rise and fall of ocean water twice a day is called
(a) Tide
(b) Ocean current
(c) Wave
Answer:
(a) Tide

Question 3.
Match the following :

Caspian Sea	Largest lake
Tide	Periodic rise and fall of water
Tsunami	Strong seismic waves
Ocean currents	Streams of water moving in definite paths

Give reasons 

Question 4.
(1) Ocean water is salty.
Answer:
Because it contains large amounts of dissolved salts.

(2) The quality of water is deteriorating.
Answer:
The quality of water is deteriorating because

1. The garbage we throw in the river.
2. Chemicals from industries and polluted water.
3. Remains of the harmful insecticides and pest resistants flowing in from the fields.
4. Unburnt or half-burnt corpses of men and animals thrown in water bodies.

For fun

Question 5.

Be a detective

(1) The name of one river is hidden in each of the sentences below. Spot it.
Example: Mandra, Vijayalakshmi, and Surinder are my best friends.
Answer :
Ravi.

(a) The snake charmer’s bustee, stables where horses are housed, and the piles of wood, all caught fire accidentally. (Hint : Another name for River Brahmaputra)
Answer:
Teesta

(b) The conference manager put a pad, material for reading, and a pencil for each participant. (Hint: A distributary on the Ganga-Brahmaputra delta)
Answer:
Padma

(c) Either jealousy or anger cause a person’s fall. (Hint: Name of juicy fruit!))
Answer:
Orange

(d) Bhavani germinated the seeds in a pot. (Hint: Look for her in West Africa)
Answer:
Niger

(e) “I am a zonal champion now,” declared the excited athletic. (Hint: The river that has the biggest basin in the world)
Answer:
Amazon

(f) The tiffin box rolled down and all the food fell in dusty potholes. (Hint: Rises in India & journeys through Pakistan)
Answer:
Indus

(g) Malini leaned against the pole when she felt that she was going to faint. (Hint: Her delta in Egypt is famous)
Answer:
Nile

(h) Samantha mesmerized everybody with her magic tricks. (Hint: London is situated on her estuary)
Answer;
Thames

(i) “In this neighborhood, please don’t yell! Owners of these houses like to have peace,” warned my father when we moved into our new flat, (Hint: colour)
Answer:
Yellow

(j) ‘Write the following words. Marc! “On”, “go”, “in” …. said the teacher to the little boy in KG Class. (Hint: Rhymes with ‘bongo’)
Answer:
Congo

Question 1.
Now make some more on your own and ask your classmates to spot the hidden name. You can do this with any name: that of a lake, mountains, trees, fruits, school items, etc.
Answer:
Students do themselves.

Carry on Detective

(2) With the help of an atlas, draw each river which you discovered in For Fun (i), on an outline map of the world.
Answer: