Major Domains of the Earth Extra Questions Chapter 5 Class 6 Geography

Chapter 5 Major Domains of the Earth Class 6 Geography Extra Questions with answers is present here that will help you in revising the chapter properly. You will get to know how questions can be framed in the examinations and prepare accordingly. Extra Questions for Class 6 will be useful in preparing yourself well before examinations.

Major Domains of the Earth Extra Questions Chapter 5 Class 6 Geography


Chapter 5 Major Domains of the Earth Very Short Answer Questions (VSAQs):


1. Define biosphere.

Answer

A narrow zone of earth where all forms of life can be found.

2. Name the part of the Earth where oxygen, nitrogen, carbon dioxide and other gases are found.

Answer

Atmosphere.

3. Name the latitude that runs through the middle of Africa.

Answer

Equator.

4. 'Maitri’ and ‘Dakshin Gangotri’ are two research stations of _______.

Answer

India.

5. Who was the first Indian woman to climb Mt. Everest?

Answer

Bachendri Pal.

6. Name the domain of earth which consists of solid rocks.

Answer

Lithosphere.

7. Why Ocean water is unfit for human use?

Answer

Because it is too salty.

8. What is the name given to a Narrow zone on earth which contains land, water and air?

Answer

Biosphere.

9. A narrow passage of water connecting two large water bodies is called __________.

Answer

Strait.

10. Name the latitude which passes through Europe.

Answer

Arctic Circle.

11. Name the longest river of the world.

Answer

River Nile.

12. What is the shape of the Pacific Ocean?

Answer

Circular.

13. The seven continents are separated by large __________ bodies.

Answer

Water.

14. Density of the air decreases with the increase in_________.

Answer

Height.

15. What is Eurasia?

Answer

The combined landmass of Europe and Asia.

16. Name the most important river of China?

Answer

River Yangtze.

Chapter 5 Major Domains of the Earth Short Answer Questions (SAQs):


1. How does the atmosphere act as a blanket?

Answer

Atmosphere acts as a blanket of the earth because it maintains a fairly even temperature both during day and night. Atmosphere also shields the earth from the strong ultraviolet rays of the sun due to the presence of ozone gas. It also protects earth from meteors.

2. What do you mean by Strait? Name the Strait between India and Sri Lanka.

Answer

A strait is a narrow passage of water connecting two large water bodies like seas and oceans. The strait between India and Sri Lanka is Palk Strait.

3. How do old and young mountains differ?

Answer

Old mountains have rounded features and are low in height such as Aravallis. It is because they are very old and have been eroded by the forces of nature like wind, water, etc. over a long period. Young mountains have conical features and are greater in height.The best example of young folded mountains is Himalaya.

4. Mention the layers of the atmosphere. Name the closest layer to the earth's surface?

Answer

The different layers of the atmosphere are:
• Troposphere
• Stratosphere
• Mesosphere
• Thermosphere
• Exosphere
Troposphere is the closest layer to the earth's surface.

5. Why is the Northern Hemisphere called the land Hemisphere?

Answer

The Northern Hemisphere is called the land hemisphere because the greater part of continental landmass lies in the northern hemisphere while on the other hand large percentage of area in the southern hemisphere is covered with oceans.

6. Why do climbers often experience breathing problems?

Answer

The climbers experience problems in breathing due to decrease in the density of air. They have to carry with them oxygen cylinders to be able to breathe at higher altitude as the density of air keeps on decreasing with increase in altitude.

7. The three domains of the earth interact with each other and affect each other in some way. Discuss.

Answer

The three domains of the earth interact with each other and affect each other. For example, the industrial effluents are thrown on the land from where they gradually flow into rivers, lakes and other water bodies. Hence, polluting both land and water. The polluted release of smoke and other gases further pollute the atmosphere. So, all the major domains are affected by one common source.

8. Write in brief about the lithosphere.

Answer

The atmosphere is composed mainly of nitrogen and oxygen, which make up about 99 per cent of clean, dry air. Nitrogen 78 per cent, oxygen 21 per cent and other gases like carbon dioxide, argon and others comprise 1 percent by volume. Oxygen is the breath of life while nitrogen helps in the growth of living organisms. Carbon dioxide, though present in minute amount, is important as it absorbs heat radiated by the earth. It is also essential for the growth of plants.

9. Write a short note on Antarctica.

Answer

Antarctica lies completely in the southern hemisphere. At the centre of the continent is the South Pole. It is permanently covered with thick ice sheets. There are no permanent human settlements here. Many countries have set up there research station here. Maitri and Dakshin Gangotri are Indian research centres.

10. Describe water cycle.

Answer

The continuous changes of the state and movement of water throughout the Earth system, i.e., the atmosphere, biosphere, lithosphere and hydrosphere is known as the water cycle. The water cycle is driven by energy from the Sun rays, which cause liquid water from Earth's surface to change into gas in a process called evaporation. As gaseous vapour rises and circulates in the atmosphere, it cools and changes back into a liquid, a process known as condensation. When water vapour condenses, tiny droplets form clouds, which return the water to Earth as precipitation.

11. What is acid rain?

Answer

Rain water is naturally acidic due to carbon dioxide, which partially reacts with water to give carbonic acid. When we talk about acid rain, we mean the enhanced effect which is caused by other gases released when fossil fuels are burnt. Two main gases are:Sulphur dioxide and Nitrogen oxide. The dilute acid falls to ground as acid rain.

12. Inspite of being called the Blue Planet, the earth experiences shortage of water. Why?

Answer

The earth experiences water shortage because 97% of the earth’s water is found in the oceans and is too salty for human use. Of the remaining 3%, large proportion is in the form of ice sheets, glaciers and under the ground. A very small percentage is available as fresh water.

13. What is ozone depletion?

Answer

Ozone depletion occurs when the natural balance between the production and destruction of stratospheric ozone is tipped. Although natural phenomena can cause temporary ozone losses, man-made synthetic compounds such as CFCs are now accepted as the main cause of this depletion. Ozone depletion, in fact, is occurring all over the world due to man-made pollution, at 19 to 30 km above the Earth's surface. However, in certain parts of the world, ozone depletion is particularly severe.

14. What is a plateau? Name the two important plateaus of the world.

Answer

A plateau is a large area of fairly level land rising much above the surrounding areas. A plateau may have steep slopes on one or more sides. The height of the plateau may range from 400 meters to several thousand meters above sea level. These are almost flat. Deccan Plateau of India and the plateau of Africa are two important examples.

15. Why is the Biosphere important for living organisms?

Answer

Biosphere is the sphere of living organisms, where lithosphere, hydrosphere and atmosphere meet and interact. Every living species on the earth is a part of the biosphere. The organisms in the biosphere are broadly divided into plants, animals, humans beings and microbes. These elements are interdependent
on one another and there is continuous interaction between them. They provide food and raw materials. The survival of the living organisms on the earth depends upon the biosphere. Thus, this sphere is so important.

Chapter 5 Major Domains of the Earth Long Answer Questions (LAQs):


1. Distinguish between stratosphere and troposphere.

Answer

TroposphereStratosphere
The troposphere is the lowest portion of Earth's atmosphere. The stratosphere is the second major layer of Earth's atmosphere, just above the troposphere and below the mesosphere
Troposphere near the Earth's surface is cooler layers higher up and warmer layers farther down. Stratosphere  is stratified in temperature, with warmer layers higher up and cooler layers farther down.
About 80 % of the total mass of the atmosphere is contained in troposphere. This contains about 19.9 % of the total mass found in the atmosphere.
It is also the layer where the majority of our weather phenomenon occurs. Very little weather phenomenon occurs in the stratosphere

2. Define global warming. State the factors responsible for it.

Answer

Global warming is the increase average temperature of the Earth's near-surface air and oceans.

• Most prominent factor is from the combustion of fossil fuels in cars, factories and electricity production. They produce carbon dioxide, which is the most common gas responsible for the global warming.
• Other contributors include methane released from landfills and fertilizers.
• Gases used for refrigeration and industrial processes.
• The loss of forests that would otherwise store CO2.

3. Which is the second largest continent after Asia? Mention four features of this continent.

Answer

Africa is the second largest continent after Asia. Four features of this continent are:
• The equator passes through the middle of Africa, splitting it into Northern Hemisphere and Southern Hemisphere.
• The Sahara Desert, the world’s largest hot desert, is located in Africa.
• The continent is bound on all sides by oceans and seas.
• The Nile, the world’s longest river flows through this continent.

4. What are the major effects of water pollution?

Answer

The major effects of water pollution are:
• The food chain is damaged. When toxins are in water, the toxins travel from the water to the animals and to humans when the animal's meat is eaten.
• Diseases can spread via polluted water. Infectious diseases such as typhoid and cholera can be extended from drinking contaminated water.
• Acid rain contains sulfate particles, which can harm fish or plant life in lakes and rivers.
• Pollutants in the water will alter the overall chemistry of the water, causing changes in acidity, temperature and conductivity. These factors all have an affect on the marine life.
• Marine food sources are contaminated or eliminated by water pollution.
• Altered water temperatures due to human actions can kill the marine life and affect the delicate ecological balance in bodies of water, especially lakes and rivers.
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