Population And Resources Class 8th Social Science Term 3 Tamilnadu Board Solution

Class 8th Social Science Term 3 Tamilnadu Board Solution
Exercise
  1. The ____________ population puts a lot of pressure on the Available resources like land…
  2. By 2025 ________________billion people will be affected by severe water scarcity. Fill in…
  3. ____________ affects a large number of people living in 110 countries. Fill in the blanks:…
  4. In the developing countries 95% of the sewage is let into ____________. Fill in the…
  5. The first Indian Remote Sensing Satellite IRS IA was launched in _______________. Fill in…
  6. Freshwater of the Earth is only Choose the correct answer:A. 30% B. 0.03% C. 3%…
  7. Droughts, erosion and global warming are caused due to Choose the correct answer:A.…
  8. The First artificial satellite launched by the Soviet Union was ______________. Choose the…
  9. India has 20% of the Population but the water available is only ____________________.…
  10. Match the following: 1. Agriculture development Semi-arid lands 2. Desertification- France…
  11. What are the results of over-exploitation of resources? Write a brief answer:…
  12. Write the impact of overpopulation on water resources. Write a brief answer:…
  13. What are the ill - effected of overpopulation in the development of countries? Write a…
  14. Name the satellites used for observing the earth’s resources. Write a brief answer:…
  15. Discuss the utilization of resources in developing and developed countries. Answer in…
  16. ‘’Large and increasing population exerts great pressures on the limited resources’’ -…
  17. How is remote sensing satellites helpful in managing resources? Answer in detail:…
Formative Assessment
  1. Discussion: How did the floods at Uttarakhand in 2013 affect the population? Was it a man…
  2. Project Work: Collect the information about Remote sensing satellites of U.S.A, France and…
  3. In 2025 what type of food, would you prefer as an Indian?
  4. On a map of Europe mark the rivers of Europe and discuss their uses. Map Skill:…
  5. On a map of India draw the major rivers and write how they are useful for the Indian…

Exercise
Question 1.

Fill in the blanks:

The ____________ population puts a lot of pressure on the Available resources like land and Water.


Answer:

The increased population puts a lot of pressure on the Available resources like land and Water.

Explanation:


The compounds and materials that are used by human beings and the living system to satisfy their needs and requirements are called resources. Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. On the other hand, non-renewable resources like coal and petroleum have only a fixed stock. They will be replenished but only after millions of years. Thus the ever-increasing population puts pressure on limited resources.



Question 2.

Fill in the blanks:

By 2025 ________________billion people will be affected by severe water scarcity.


Answer:

By 2025 five billion people will be affected by severe water scarcity.

Explanation:


Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. Even though water is a renewable resource and can be replenished able, nearly 60% of all the fresh water sources are under threat by pollution. This can lead to severe water scarcity. It is estimated that by 2025 five billion people will be affected by severe water scarcity.



Question 3.

Fill in the blanks:

____________ affects a large number of people living in 110 countries.


Answer:

Desertification affects a large number of people living in 110 countries.

Explanation:


Desertification is the conversion of fertile and cultivable land into barren land by human and natural forces. Human activities like mining, quarrying and construction have aggravated desertification in many countries. The loss of fertile and natural land by desertification amounts to 35% of the land surface. Desertification affects a large number of people living in 110 countries. It occurs mainly in the semi-arid deserted regions.



Question 4.

Fill in the blanks:

In the developing countries 95% of the sewage is let into ____________.


Answer:

In the developing countries, 95% of the sewage is let into rivers.

Explanation:


Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. Even though water is a renewable resource and can be replenished able, nearly 60% of all the fresh water sources are under threat by pollution. Nearly 95% of the sewage is let into rivers in developing countries from the discharge from factories and other chemical pollutants. All the river systems in the developing countries are under the threat of pollution from sewer waste.



Question 5.

Fill in the blanks:

The first Indian Remote Sensing Satellite IRS IA was launched in _______________.


Answer:

The first Indian Remote Sensing Satellite IRS IA was launched in 1988.

Explanation:


With the development of technology, new techniques like remote sensing can be used for analysing the change in the stock of natural resources occurring in the world. The depletion and accumulation of resources can be identified from the satellites launched using the remote sensing technology. With this objective, India launched the IRS IA satellite in 1988.



Question 6.

Choose the correct answer:

Freshwater of the Earth is only

A. 30%

B. 0.03%

C. 3%


Answer:

The earth surface is covered with 77% water and 23% land area. Most of the water resources on the earth's surface are in the oceans and hence cannot be used. The most proportion of the freshwater is in the form of frozen ice caps in the poles. Thus only 0.03% of the water resources are available as potable water.


Question 7.

Choose the correct answer:

Droughts, erosion and global warming are caused due to

A. Deforestation

B. Afforestation

C. Hunting


Answer:

Deforestation is the loss of forest cover by the cutting of trees. Deforestation can be the result of the expansion of industrial areas, agricultural land, grazing land and so on. Nearly 80% of the forests are under the threat of deforestation. It can result in many ecological crises like droughts, erosion and global warming.


Question 8.

Choose the correct answer:

The First artificial satellite launched by the Soviet Union was ______________.

A. Sputnik I

B. Sputnik II

C. Kitsat


Answer:

With the development of technology, new techniques like remote sensing can be used for analysing the change in the stock of natural resources occurring in the world. The depletion and accumulation of resources can be identified from the satellites launched. Artificial is an extra-terrestrial body that is launched to understand the occurrences in the space, earth or other planets. The Soviet Union launched the first artificial satellite in1957. It was named as Sputnik I.


Question 9.

Choose the correct answer:

India has 20% of the Population but the water available is only ____________________.

A. 5%

B. 4%

C. 2%


Answer:

Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. Even though water is a renewable resource and can be replenished able, nearly 60% of all the fresh water sources are under threat by pollution. Nearly 95% of the sewage is let into rivers in developing countries from the discharge from factories and other chemical pollutants. All the river systems in the developing countries are under the threat of pollution from sewer waste. India is the second largest populous country. But the freshwater resources available is only 4%.


Question 10.

Match the following:



Answer:



Explanation:


1. With the rapid growth in population, the supply of food has to be increased. Thus more land has to be brought under cultivation. With the increase in population, there should be a steady growth in agricultural production to meet the needs of the ever-increasing population. As the land in cultivation becomes limited, more lands would be brought under cultivation to increase the agricultural productivity.


2. Desertification is the conversion of fertile and cultivable land into barren land by human and natural forces. Human activities like mining, quarrying and construction have aggravated desertification in many countries. The loss of fertile and natural land by desertification amounts to 35% of the land surface. Desertification affects a large number of people living in 110 countries. It occurs mainly in the semi-arid deserted regions.


3. Commercial energy sources cover all the major energy requirements of the world. The major component of commercial energy is the non-renewable energy resources like coal and oil. Non-renewable resources like coal and petroleum have only a fixed stock. They will be replenished but only after millions of years. Thus the ever-increasing population puts pressure on limited resources.


4. With the development of technology, new techniques like remote sensing can be used for analysing the change in the stock of natural resources occurring in the world. The depletion and accumulation of resources can be identified from the satellites launched using the remote sensing technology. With this objective, USA launched the LANDSAT satellite.


5. With the development of technology, new techniques like remote sensing can be used for analysing the change in the stock of natural resources occurring in the world. The depletion and accumulation of resources can be identified from the satellites launched using the remote sensing technology. With this objective, France launched the SPOT satellite.



Question 11.

Write a brief answer:

What are the results of over-exploitation of resources?


Answer:

The compounds and materials that are used by human beings and the living system to satisfy their needs and requirements are called resources. Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. On the other hand, non-renewable resources like coal and petroleum have only a fixed stock. They will be replenished but only after millions of years. Thus the ever-increasing population puts pressure on limited resources. The over-exploitation of resources result in the water scarcity, deforestation, desertification, food shortages, exhaustion of minerals and pollution. This can further result in other ecological problems like global warming.



Question 12.

Write a brief answer:

Write the impact of overpopulation on water resources.


Answer:

Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. Even though water is a renewable resource and can be replenished able, nearly 60% of all the fresh water sources are under threat by pollution. The main reason for this is the increasing population. Nearly 95% of the sewage is let into rivers in developing countries from the discharge from factories and other chemical pollutants. All the river systems in the developing countries are under the threat of pollution from sewer waste. Increased pollution of water resources results in the pollution of surface and underground water. Pressures building on water resources has created tension in users. The upcoming conflicts may be due to the shortage of potable water.



Question 13.

Write a brief answer:

What are the ill – effected of overpopulation in the development of countries?


Answer:

The compounds and materials that are used by human beings and the living system to satisfy their needs and requirements are called resources. Resources can be classified as renewable and non-renewable. Renewable resources are those resources that will get renewed and replenished through physical, chemical and mechanical processes. On the other hand, non-renewable resources like coal and petroleum have only a fixed stock. They will be replenished but only after millions of years. Thus the ever-increasing population puts pressure on limited resources. The over-exploitation of resources result in the water scarcity, deforestation, desertification, food shortages, exhaustion of minerals and pollution. This can further result in other ecological problems like global warming. The increased population puts a lot of pressure on available resources like land and water. Each year, the human being increases, but the number of natural resources are the same and cannot sustain.



Question 14.

Write a brief answer:

Name the satellites used for observing the earth’s resources.


Answer:

With the development of technology, new techniques like remote sensing can be used for analysing the change in the stock of natural resources occurring in the world. The depletion and accumulation of resources can be identified from the satellites launched using the remote sensing technology. With this objective, many countries have launched different satellites. France launched the SPOT satellite, USA launched the LANDSAT, Korea launched KITSAT and China launched the Yaogan. India also launched its first remote sensing satellite- the IRS IA in 1988. It also launched many others including IRS- 1B, 1C, 1D, CARTOSAT and RESOURCESAT.



Question 15.

Answer in detail:

Discuss the utilization of resources in developing and developed countries.


Answer:

Developing countries population puts a strain on the local environment and the limited resources. These countries struggle to make demands for food, fresh water, timber and fuel. This, in turn, leads to the degradation of the environment.

Developed countries have more use of earth’s resources. Population pressure in the developed countries put a greater strain on global resources and the environment than that in less developed countries because of their very high standard of livings.



Question 16.

Answer in detail:

‘’Large and increasing population exerts great pressures on the limited resources’’ – Explain.


Answer:

large and increasing population put a lot of pressure on available resources like land and water. Each year, the human being increases, but the number of natural resources are same and cannot sustain because the pressure that is exerted is on the limited resources.



Question 17.

Answer in detail:

How is remote sensing satellites helpful in managing resources?


Answer:

the remote sensing satellites data provide valuable information about the land resources such as geology, soil, vegetation, water bodies and minerals. This information helps countries to plan for a sustainable future.




Formative Assessment
Question 1.

Discussion:

How did the floods at Uttarakhand in 2013 affect the population? Was it a man made a natural disaster?


Answer:

Heavy rains, coupled with cloudbursts, in the northern hill state of Uttarakhand, North India started on the 14th June 2013 and continued for about 60 hours, causing mass flooding and landslides. The monsoon rains were early and powerful and devastated five districts, affecting an estimated 300,000 people. At least 1,000 were killed, although the death toll is believed to be closer to 10,000 with 5,748 people who had gone missing and are now presumed to be dead.

There has been huge infrastructural damage caused by the catastrophe. Continuous rains and landslides damaged over 1500 roads and 154 bridges, while over 2,000 houses were destroyed. According to Government reports 18,228 cattle have now been killed and 20,000 hectares of agricultural land was severely damaged.


It was both man-made and a natural disaster.



Question 2.

Project Work:

Collect the information about Remote sensing satellites of U.S.A, France and Japan.


Answer:

Remote sensing satellites of USA are:

•ATLAS DMSP-SD2F3


•SPACE SHUTTLE COLUMBIA SDS-2


•TITAL 34D


•ATLAS DMSP-SD2-F6


Satellites of France


•SPOT 6 AND SPOT 7 (high-resolution optical imaging remote sensing satellite)


Satellites of Japan:


•MOMO 1


•FUYO 1


•MIDORI-1


•DAICHI


•MIDORI 2



Question 3.

In 2025 what type of food, would you prefer as an Indian?


Answer:

I would like to prefer all the green vegetable and the food that has been provided till now. I would not like to change it.



Question 4.

Map Skill:

On a map of Europe mark the rivers of Europe and discuss their uses.


Answer:


Danube river-


The Danube, at 1,780 miles long, is the second-longest river in Europe. The river stretches through 10 countries, including Germany, Hungary, Serbia, Croatia, Austria, Slovakia, Romania, Moldova, Ukraine and Bulgaria, and famously flows through cities like Vienna and Budapest. Travellers can experience many of the river's sights by embarking on a cruise along its waterways. Danube River Cruises, which are offered by Viking Cruises, typically stop in Cologne, Budapest, Nuremberg, Belgrade and Krems. Following the river is a way to experience several Eastern European cities in one trip. Famous monuments, such as the Hungarian Parliament, have been erected on its coast.


Through France: Loire


The Loire River is one of several rivers that flow through France. This river runs east to west, splitting the country midway. It's part of the famed Loire Valley, an area famous for its local wines and historic towns. The region is easily accessible from Paris and well-known for its many castles, which include Clemenceau and Chambord. Many great wines come from the Valley, including Sancerre, a popular French white wine. Take a tour through the area or rent a car to experience it at your own pace. Be sure to make a stop in Amboise, a picturesque town built on the foundations of an old fortress.


Through Germany: Elbe


Once, the Elbe River helped form the border between East and West Germany; however, today, it flows through both Germany and the Czech Republic. It links popular destinations like Dresden and Prague and gives visitors views of German and Czech cities. Most cruises down the Elbe also bring travellers to lesser-known spots, such as Wittenberg and Meissen, and are an ideal way to experience German culture in a new way. Look for cruises that start in Berlin, located a short distance from the river, and end in Prague.


Through Western Europe: Rhine


The Rhine begins in Switzerland and streams 766 miles to Rotterdam in the Netherlands, where it ends in the North Sea. The river, known as "Old Father Rhine," runs past cliff-side castles, vineyards and, of course, picturesque towns that dapple the shores through six countries. Cities like Strasbourg and Cologne sit along the coast, making it an ideal journey for visitors to Europe. Companies like Viking River Cruises and Riviera Travel offer cruises along the waterway, most of which begin in Amsterdam. Look for the one that stops in your desired destinations.


Through Russia: Volga


The Volga is the longest river in Europe, stretching 2,294 miles across Russia. It flows from the remote Valdai Hills to the Caspian Sea, and half of Russia's river cargo is transported along the river. The waters of the Volga are used to irrigate the steppe regions of southern Russia. Because of its importance in the country, the Volga has mythological status in Russia, and many iconic sites are found along its banks. Travellers can cruise along the river during the warmer months of the year, usually from March until mid-December. Select one of Viking Cruises' Volga River cruises, which travel from Moscow to St. Petersburg, to see the best of the river.


Other Rivers


Europe has numerous other rivers, not all as large and impressive as these. Visit the Seine, which runs through Paris, or the Rhone, which flows through a popular wine region in France. The Po is Italy's longest river, traversing the northern part of the country to the Adriatic Sea, and the Oder River stretches across the Czech Republic and Poland, ending in the Baltic Sea. Russia is home to two other large rivers besides the Volga: the Don and the Dnieper. Cruises don't typically run on the smaller rivers, but you can check them out while visiting the cities that surround them. The Rhone, in particular, is worth a visit when in southern France.



Question 5.

Map Skill:

On a map of India draw the major rivers and write how they are useful for the Indian Population.


Answer:


A mother, we know, has to suffer for her children. Our rivers have a similar fate. All our big rivers are born on some hill or mountain. They are fed by snow or rain or both. So, the Indus, the Ganges, the Kosi, the Narmada and the Kaveri flow all the year round. Other rivers are born only during the rains. So, they dry up in summer.


In this way, our rivers feed on ordinary water – snow water and rainwater. But the water they give us is the water of life:


They give health to our fields and forests. The silt they bring is food for our soil. A barren piece of land is turned into a lovely garden.


They feed not only our land and plants but also our mills and factories. River water is turned into a new power called electricity, and thus, in turn, helps our trade and industry.


A large number of Indian cities such as New Delhi, Kolkata, Allahabad, Agra, etc., are situated on the bank of rivers.


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