Chapter-Oceans and Continents Social Science class 6 in english Medium CBSE Notes

Chapter 2. Oceans and Continents

Assignment

A. Multiple Choice Questions (MCQs)

1. Why is the Earth called the Blue Planet?
   1. Because its atmosphere is blue
   2. Because almost three-fourths of its surface is covered with water
   3. Because all continents are blue
   4. Because the sky is blue
2. Which is the largest of the five oceans?
   1. Atlantic Ocean
   2. Indian Ocean
   3. Pacific Ocean
   4. Arctic Ocean
3. Which is the smallest ocean?
   1. Southern Ocean
   2. Arctic Ocean
   3. Indian Ocean
   4. Atlantic Ocean
4. Which ocean lies to the west of India?
   1. Bay of Bengal
   2. Arabian Sea
   3. Pacific Ocean
   4. Southern Ocean
5. Which ocean lies to the east of India?
   1. Arabian Sea
   2. Bay of Bengal
   3. Atlantic Ocean
   4. Arctic Ocean
6. Which is the third-largest ocean?
   1. Indian Ocean
   2. Atlantic Ocean
   3. Southern Ocean
   4. Arctic Ocean
7. Which is the largest island in the world?
   1. Madagascar
   2. Greenland
   3. Sri Lanka
   4. Andaman
8. Which is the largest continent?
   1. Africa
   2. Europe
   3. Asia
   4. Australia
9. Which is the smallest continent?
   1. Europe
   2. Australia
   3. Antarctica
   4. South America
10. Which continent surrounds the South Pole?
    1. Asia
    2. Australia
    3. Antarctica
    4. Europe
11. What is a piece of land completely surrounded by water called?
    1. Peninsula
    2. Island
    3. Continent
    4. Gulf
12. Which of the following is a natural disaster originating in the ocean?
    1. Earthquake only
    2. Tsunami
    3. Drought
    4. Heat wave
13. A tsunami is generally caused by:
    1. Heavy rainfall only
    2. A strong earthquake or volcanic eruption at the ocean bottom
    3. Strong sunlight
    4. Deforestation
14. World Oceans Day is observed on:
    1. 5 June
    2. 8 June
    3. 21 June
    4. 26 December
15. What was the name of India's first scientific base station in Antarctica?
    1. Maitri
    2. Bharati
    3. Dakshin Gangotri
    4. Himadri

B. Fill in the Blanks

1. The Earth is often called the __________ Planet.
2. Almost __________ of the Earth's surface is covered with water.
3. The largest ocean is the __________ Ocean.
4. The smallest ocean is the __________ Ocean.
5. The Indian Ocean is the __________ largest ocean.
6. The __________ Sea lies to the west of India.
7. The __________ of Bengal lies to the east of India.
8. A piece of land surrounded by water on all sides is called an __________.
9. __________ is the largest island in the world.
10. The largest continent is __________.
11. The smallest continent is __________.
12. India's first scientific base station in Antarctica was __________.
13. A huge and powerful ocean wave is called a __________.
14. World Oceans Day is observed on __________.
15. Excessive fishing that reduces marine life is called __________.

C. True or False

1. Almost three-fourths of the Earth's surface is covered with water.
2. The Pacific Ocean is the smallest ocean.
3. The Arctic Ocean is the smallest of the five oceans.
4. The Arabian Sea lies to the west of India.
5. The Bay of Bengal lies to the east of India.
6. Greenland is the largest island in the world.
7. Asia is the smallest continent.
8. Antarctica is located around the South Pole.
9. Oceans have no influence on rainfall.
10. Ocean flora produces more than half of the world's oxygen.
11. A tsunami can travel thousands of kilometres.
12. World Oceans Day is observed on 8 June.
13. Lakshadweep is located in the Bay of Bengal.
14. Andaman and Nicobar Islands are located in the Bay of Bengal.
15. Overfishing can harm marine life.

D. Match the Following

Column A	Column B
1. Pacific Ocean	a. Smallest ocean
2. Arctic Ocean	b. Largest ocean
3. Greenland	c. Largest island
4. Asia	d. Largest continent
5. Australia	e. Smallest continent
6. Dakshin Gangotri	f. First Indian Antarctic base
7. 8 June	g. World Oceans Day
8. Bay of Bengal	h. East of India
9. Arabian Sea	i. West of India

E. Very Short Answer Questions

1. Why is the Earth called the Blue Planet?
2. What is an ocean?
3. What is a continent?
4. What is an island?
5. Name the five oceans.
6. Which is the largest ocean?
7. Which is the smallest ocean?
8. Which ocean is located around the North Pole?
9. Which ocean surrounds Antarctica?
10. Which sea lies to the west of India?
11. Which sea lies to the east of India?
12. Name the largest island in the world.
13. Name the largest continent.
14. Name the smallest continent.
15. What is marine flora?
16. What is marine fauna?
17. What is groundwater?
18. What is a cyclone?
19. What is a tsunami?
20. When is World Oceans Day observed?

F. Short Answer Questions

1. Why is there more water in the Southern Hemisphere than in the Northern Hemisphere?
2. Why are oceans important for the Earth's climate?
3. How do oceans help in bringing rainfall to continents?
4. How are oceans connected with human life?
5. Why is the Indian Ocean particularly important for India?
6. Explain the difference between an ocean, a sea, a bay and a gulf.
7. Why is freshwater important for life?
8. How do oceans support marine life?
9. What is the importance of islands for a country like India?
10. What are the two major groups of islands belonging to India?
11. Why can continents be counted in different ways?
12. What is Eurasia?
13. Why are Europe and Asia generally considered separate continents?
14. Why is Antarctica important for scientific research?
15. How does ocean pollution affect marine life?

G. Long Answer Questions

1. Explain the distribution of oceans and continents between the Northern and Southern Hemispheres.
2. Name the five oceans and arrange them from the largest to the smallest.
3. Explain the importance of oceans in regulating climate, bringing rainfall and supporting life on Earth.
4. Describe the importance of oceans in human history, including migration, trade, transportation, fishing and culture.
5. What is a tsunami? Explain its causes and effects with reference to the Indian Ocean tsunami of 2004.
6. Explain the different ways in which the continents can be counted as four, five, six and seven.
7. Describe India's major island groups and state where they are located.
8. Describe India's scientific activities in Antarctica.
9. Explain the major threats to oceans and suggest ways to protect marine environments.

H. Give Reasons

1. Why is the Earth called the Blue Planet?
2. Why does the Southern Hemisphere contain more water than the Northern Hemisphere?
3. Why are oceans important for agriculture in India?
4. Why are oceans called the “lungs of the planet”?
5. Why can tsunamis be extremely destructive?
6. Why is Greenland called an island and not a continent?
7. Why are Europe and Asia generally treated as separate continents?
8. Why should plastic waste be prevented from entering oceans?
9. Why is overfishing harmful to marine ecosystems?

I. Differentiate Between

1. Ocean and Continent
2. Continent and Island
3. Seawater and Freshwater
4. Cyclone and Tsunami
5. Marine Flora and Marine Fauna
6. Arabian Sea and Bay of Bengal

J. Arrange in Correct Order

1. Arrange the five oceans from largest to smallest.
2. Arrange the following in the correct order from largest to smallest:
   Indian Ocean, Arctic Ocean, Pacific Ocean, Southern Ocean, Atlantic Ocean
3. Arrange the following stages of the water cycle in a logical sequence:
   Rainfall, evaporation, cloud formation, water returning to oceans

K. Map Work

On a blank world map, locate and label the following:

• Pacific Ocean
• Atlantic Ocean
• Indian Ocean
• Southern Ocean
• Arctic Ocean
• Asia
• Africa
• Europe
• North America
• South America
• Antarctica
• Australia

On an outline map of India, locate and label:

• Arabian Sea
• Bay of Bengal
• Andaman and Nicobar Islands
• Lakshadweep Islands

L. Activity-Based Questions

1. Look at a world map and identify which oceans belong to the Northern Hemisphere, Southern Hemisphere or both.
2. Observe a map of the Earth from above the North Pole and South Pole. Which hemisphere appears to have more water?
3. Discuss in groups why oceans are important for human life.
4. Make a table showing the five oceans and their order according to size.
5. Prepare a chart showing the seven continents and their relative sizes.
6. Find out the names of the major islands of India and mark them on a map.
7. Discuss in class how plastic pollution affects marine animals.
8. Prepare a short poster on “Save Our Oceans”.

M. HOTS – Think and Answer

1. If oceans disappeared from the Earth, what major changes would occur in rainfall and life on land?
2. Why do you think the Northern Hemisphere has more land while the Southern Hemisphere has more water?
3. If a country has a long coastline, how can oceans become an advantage as well as a danger for that country?
4. Why is it important for countries around an ocean to cooperate in dealing with tsunamis?
5. Why should overfishing be controlled even if fishing provides food and employment?
6. Suppose a large amount of plastic enters the ocean near a coastal city. What effects could it have on marine animals and people living there?
7. Why might different people or organisations use different numbers of continents even though they are looking at the same Earth?
8. How can protecting oceans also help protect human life on land?

N. Case-Based Question

A coastal region receives a warning that a tsunami may reach its shores after a powerful earthquake under the ocean. The authorities ask people living near the coast to move to safer areas. Emergency teams begin preparations.

1. What natural disaster is described in the case?
2. What can cause such a disaster?
3. Why is an early warning important?
4. What steps should people take after receiving the warning?
5. Which organisation in India deals with disaster management at the national level?

O. Research and Explore

1. Find out the names of India's three scientific bases in Antarctica.
2. Find out about the Indian Ocean Tsunami Warning System.
3. Research one famous island of the world and write five facts about it.
4. Find out about one endangered marine animal and explain why it needs protection.
5. Collect information about the 2004 Indian Ocean tsunami and prepare a short report.

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