Part II: Geography
Chapter – 3
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Exercise
A. Answer the following questions in brief:
1. What is hydroelectricity? Why is
it popular?
Ans: An electricity which is
produced from water is called a hydroelectricity. It is popular because this
form of energy is renewable and cheap and helps in reducing emission of
greenhouse gases.
2. What are the three main functions
of multi projects?
Ans: The three main functions
of multipurpose project are –
i.
It provides water for irrigation.
ii. It
generates hydroelectricity.
iii. It
also controls the floodwater.
3. Why is water considered a natural
resource?
Ans: Water is considered a
natural resource because water occurs naturally in the environment and is
useful to humans and other living organisms. Hence it is a natural resource.
4. How are water bodies polluted?
Ans: The water bodies by
domestic sewage, organic waste, plant nutrients, toxic chemicals, sediments,
oil slick and radioactive substances that flow into them.
5. From what sources would you get
your supply of freshwater?
Ans: From the Lakes, rivers,
ponds and streams.
B. Answer the following questions in detail.
1. Why is there water scarcity in
the world?
Ans: There is water scarcity
in the world because of the increasing population, human activities and climate
change.
2. How is the world trying to
conserve the water?
Ans: Some of the major steps
taken to conserve water are as follow-
i.
Sea water desalination
ii.
River cleaning to improve quality of
water.
iii.
Water reuse and recycling
iv.
Rainwater Harvesting.
v.
Afforestation to reduce run-off.
3. Write an account of the major
usage of water.
Ans: The major usage of water
are agriculture, industry and domestic purposes. Approximately 70% of water are
used in agriculture, primarily for irrigation. The use of water by industry
varies with the level of development.
4. How can you conserve water at
home?
Ans: We can conserve the water
at home by-
1. Turn
off the tap while brushing your teeth.
2. Mend
leaking taps.
3. Reduce
your shower time.
4. Don’t
leave the water running while washing dishes or clothes.
5. Avoid
too much of flushing of clothes.
5. Why are multi-purpose projects popular?
Ans: The multi-purpose
projects are popular because-
i. It
produces hydroelectricity,
ii. It controls the flood,
iii.
It provides water for irrigation.
iv.
It also supports piscicultures and
tourism.
C. Fill in the Blanks.
1. Hydroelectricity
2. Pollute
3. Agriculture
4. Conserve
5. Industry
D. Tick the correct answers.
1. (b)
2. (d)
3. (b)
4. (b)
5. (a)
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