Oceans and Continents Class 6 Extra Questions and Answers

Students often revise Class 6 SST Extra Questions and Class 6th SST Chapter 2 Oceans and Continents Important Extra Question Answer before their exams for better preparation.

Oceans and Continents Class 6th Extra Question Answer

Class 6 Social Science SST Chapter 2 Oceans and Continents Class 6 Extra Questions and Answers

Oceans and Continents Class 6 Extra Questions Very Short Answer Type

Question 1.
Why is Earth called the ‘blue planet’?
Answer:
Because most of its surface is covered with water, which appears blue from space.

Question 2.
What are the five oceans mentioned in the text?
Answer:
Pacific Ocean, Atlantic Ocean, Indian Ocean, Arctic Ocean, and Southern Ocean.

Question 3.
What is the main cause of a tsunami?
Answer:
Strong earthquakes or volcanic eruptions at the bottom of the ocean.

Question 4.
What does the motto “Sam noh Varunah” mean?
Answer:
“Be auspicious to us, O Varuna.”

Question 5.
Which two bodies of water are on either side of India?
Answer:
The Arabian Sea and the Bay of Bengal.

Question 6.
What is the most widespread color seen from outer space when looking at Earth?
Answer:
Blue, representing water.

Question 7.
What nickname did early astronauts give to Earth?
Answer:
The ‘blue planet’.

Question 8.
What are the largest water bodies on Earth called?
Answer:
Oceans.

Question 9.
What is the Indian Navy’s motto?
Answer:
“Sam noh Varunah” which means “Be auspicious to us, O Varuna.”

Question 10.
Which continent is mentioned as being explored by the Indian Antarctica Programme?
Answer:
Antarctica.

Question 11.
What is a continent?
Answer:
A continent is a large landmass separated by a water body, such as ocean or sea.

Question 12.
How many continents are there in the world? Name the largest continent of the world.
Answer:
There are seven continents in the world. Asia is the largest continent.

Question 13.
State some of the characteristics of the continent of Australia.
Answer:
(i) Australia is the smallest continent that lies entirely in the Southern Hemisphere.
(ii) It is surrounded on all sides by oceans and seas. It is called the Island Continent.

Question 14.
What is included in Marine flora?
Answer:
The marine flora includes tiny plants called algae and all kinds of seaweeds.

Question 15.
Name the island groups of India.
Answer:
Andaman and Nicobar Islands in the Bay of Bengal and Lakshadweep Islands in the Arabian Sea.

Question 16.
Name the first scientific base station in India.
Answer:
In 1983, India established its first scientific base station called ‘Dakshin Gangotri’.

Question 17.
Name the natural disasters occurs in ocean.
Answer:
Tsunami, violent events with extreme rainfall or very strong winds, such as cyclones, which can cause widespread damage to coastal regions of the world.

Question 18.
How much of the Earth’s surface is actually covered with water?
Answer:
Almost three-fourths of the Earth s surface is actually covered with water.

Question 19.
What is disaster management?
Answer:
Events that lead to loss of life and property are handled under disaster management.

Question 20.
Name the two main divisions of the Earth’s surface.
Answer:
The two main divisions of the Earth’s surface are:
(i) Continents
(ii) Ocean basins

Oceans and Continents Class 6 Extra Questions Short Answer Type

Question 1.
What is the purpose of World Occans Day according to the United Nations?
Answer:
To remind us of the major role the ocean plays in everyday life, serving as the lungs of our planet, a major source of food and medicine, and a critical part of the biosphere.

Question 2.
Explain the role of oceans in the Earth’s water cycle and climate regulation.
Answer:
Oceans play a critical role in the Earth’s water cycle by contributing to rainfall through evaporation and precipitation. They also regulate the climate by absorbing and distributing heat, producing oxygen, and supporting diverse marine life.

Question 3.
What are the challenges faced by marine environments, and what actions are necessary for their protection?
Answer:
Marine environments face challenges such as pollution from plastic waste and chemicals, overfishing, and habitat destruction. Protecting them requires reducing pollution, sustainable fishing practices, international cooperation, and raising awareness about marine conservation.

Question 4.
How are continents counted differently, and which count is most widely adopted?
Answer:
Continents can be counted as four, five, six, or seven based on different criteria, but the most widely adopted count is seven continents: Africa, Antarctica, Asia, Australia, Europe, North America, and South America.

Question 5.
What is the significance of the Indian Antarctica Programme mentioned in the text?
Answer:
The Indian Antarctica Programme, which began in 1981, explores Antarctica, conducting research on climate and environment evolution. It established India’s first scientific base station, Dakshin Gangotri, in 1983.

Question 6.
What is Tsunami?
Answer:
A tsunami is a natural disaster that originates in the ocean. It is a huge and powerful wave generally caused by a strong earthquake or a volcanic eruption at the bottom of the ocean. Tsunamis can travel thousands of kilometres and submerge coastal areas, causing widespread damage.

Question 7.
Difference between landmass and continent.
Answer:
A large body of land is called a ‘landmass’, and a large continuous expanse of land is called a ‘continent’.

Question 8.
Why Earth is called as blue planet?
Answer:
When seen from outer space, the Earth appears mostly blue because of the presence of water on the earth. Indeed, early astronauts lovingly called the Earth the ‘blue planet’.

Question 9.
How the oceans are polluted by human activity?
Answer:
Humans throw several million tonnes of plastic waste into the oceans every year, choking marine life. Overfishing (excessive fishing) is another cause for the decline of marine life.

Oceans and Continents Class 6 Extra Questions Long Answer Type

Question 1.
Discuss the significance of oceans and continents in shaping the Earth’s climate and life.
Answer:
Oceans and continents play a vital role in shaping the climate of the Earth by affecting all aspects of life, including plants, animals, and human life. They influence weather patterns, provide habitats for diverse species, and contribute to the water cycle, which is essential for rainfall and agriculture. Oceans also produce more than half of the world’s oxýgen through marine flora, regulating the climate and sustaining life on Earth.

Additionally, oceans have historical and cultural significance, as they have been used for migration, trade, military campaigns, and as a food source through fishing. Coastal cultures are rich with tales and legends about the sea, indicating the deep impact of oceans on humanity.

Question 2.
Explain the impact and aftermath of the 2004 Indian Ocean tsunami on India.
Answer:
The 2004 Indian Ocean tsunami, caused by an earthquake in Indonesia on 26 December 2004, had a devastating impact on India. Over two lakh people lost their lives across the affected regions. In India, the Andaman and Nicobar Islands, along with the coasts of Tamil Nadu and Kerala, were severely affected, suffering significant damage and loss of life.

The disaster highlighted the need for effective early warning systems and disaster management. Consequently, many countries, including India, now collaborate in early warning systems like the Indian Ocean Tsunami Warning System to protect lives and property from future tsunamis.

Question 3.
Discuss the challenges faced by the marine environment and the collective responsibility to protect it.
Answer:
The marine environment faces several challenges due to human activities. Pollution, particularly from plastic waste, is a significant issue, with millions of tonnes of plastic being dumped into the oceans each year, choking marine life. Other forms of pollution include chemical runoff, oil spills, and noise pollution, all of which harm marine ecosystems. Overfishing is another major concern, leading to the decline of marine species.

Protecting the marine environment requires collective responsibility and action to reduce pollution, implement sustainable fishing practices, and support conservation efforts. International cooperation and awareness campaigns, such as World Oceans Day, play a crucial role in promoting the protection of oceans for the future of the planet and humanity.

Question 4.
What are the roles of oceans in supporting marine life and regulating the Earth’s climate?
Answer:
Oceans support a vast diversity of marine life, including plants like algae and seaweeds, and animals such as fish, dolphins, whales, and deep-sea creatures. Each part of the ocean, from the sun-lit surface to the dark depths, hosts unique ecosystems. Oceans also play a critical role in regulating the Earth’s climate by absorbing and distributing heat around the planet.

They contribute to the water cycle, which is essential for rainfall, and produce more than half of the world’s oxygen through marine flora, earning them the title of ‘the planet’s lungs’. By stabilizing temperatures and supporting the water cycle, oceans help maintain a habitable environment on Earth.

Question 5.
Oceans play a crucial role in regulating the climate and sustaining life on Earth. Justify the statement.
Answer:
Oceans send rain to the continents, this is part of the Earth’s water cycle. Without oceans, there would be no rainfall! The Earth would be a desert. Moreover, more than half of the world’s oxygen is produced by the oceans’ flora, which is why they are called ‘the planet’s lungs’. The oceans, therefore, play a crucial role in regulating the climate and sustaining life on Earth.

Question 6.
Oceans have deeply impacted humanity in many ways. Explain.
Answer:
Oceans have deeply impacted humanity in many other ways. From early times, people have used oceans and seas to migrate to other regions, to trade in all kinds of goods, to conduct military campaigns, and as a source of food through fishing. Oceans have also nourished the cultures of coastal people all over the world. Almost all of them have tales and legends about the sea, sea gods and goddesses, sea monsters and treasures from the sea — the oceans’ dangers but also their blessings.

Question 7.
Write the contribution of United Nations.
Answer:
The United Nations has designated 8th June as World Oceans Day to “remind us all of the major role the ocean plays in everyday life. It serves as the lungs of our planet, a major source of food and medicine and a critical part of the biosphere.”

Question 8.
How the marine environment is under threat?
Answer:
Scientific studies have shown how the oceans are polluted by human activity—we throw several million tonnes of plastic waste into the oceans every year, choking marine life. There are several other forms of pollution. As a result, the marine environment is under threat. Overfishing (excessive fishing) is another cause for the decline of marine life. It is our collective responsibility to protect oceans for the future of the planet and of humanity.

Question 9.
How is the Atlantic Ocean different from the Arctic Ocean?
Answer:
Atlantic Ocean:
(i) The Atlantic Ocean is the second-largest ocean in the world.
(ii) It is ‘S’ shaped. It is flanked by North and South America on the western side, and Europe and Africa on the eastern side.
(iii) The coastline of the Atlantic Ocean is highly indented, which provides an ideal location for natural harbours and ports.
(iv) From the point of view of commerce, it is the busiest ocean.

Arctic Ocean:
(i) The Arctic Ocean is located within the Arctic Circle and surrounds the North Pole.
(ii) It is connected with the Pacific Ocean by a narrow stretch of shallow water known as Bering Strait.
(iii) It is bound by northern coasts of North America and Eurasia.

Oceans and Continents Class 6 Source-based Questions

1. Read the below passage and answer the following questions:

Although we have listed five oceans, it is clear from the map that they are not really separate. The lines that divide them on the map are no more than conventions – the natural world does not follow such boundaries. Seawater, for example, constantly flows across different oceans, sustaining a rich diversity of marine liff. Many plant and animal species can be found across multiple oceAnswer:

The marine flora includes tiny plants called algae and all kinds of seaweeds; the marine fauna consists of thousands of species of colourful fish, dolphins, whales, and countless mysterious deep-sea creatures. Each part of the ocean, from the sun-lit surface to the dark depths, has its own diverse life forms.

Question i.
Why are the lines dividing the five oceans on the map considered to be conventions rather than natural boundaries?
Answer:
The lines dividing the five oceans on the map are considered conventions because the natural world does not follow such boundaries. Seawater flows freely across different oceans, making these divisions artificial.

Question ii.
What types of marine life are sustained by the interconnected flow of seawater across different oceans?
Answer:
The interconnected flow of seawater sustains a rich diversity of marine life, including marine flora such as algae and seaweeds, and marine fauna such as colorful fish, dolphins, whales, and deep-sea creatures.

Question iii.
What are some examples of marine flora and fauna found across different oceans?
Answer:
Examples of marine flora include tiny plants called algae and various seaweeds, while examples of marine fáuna include colourful fish, dolphins, whales, and numerous deep-sea creatures.

2. Read the below passage and answer the following questions:

The oceans together hold most of the water available on the planet. But this seawater is salty and unfit for consumption by most land animals, including humAnswer:On the other hand, freshwater makes up a very small proportion of the planet’s water resources; it is found in glaciers, rivers, lakes, in the atmosphere and also underground.

Question i.
Why is seawater unfit for consumption by most land animals, including humans?
Answer:
Seawater is unfit for consumption by most land animals, including humans, because it is salty.

Question ii.
Where can freshwater be found on Earth?
Answer:
Freshwater can be found in glaciers, rivers, lakes, in the atmosphere, and underground (called groundwater).

Question iii.
What is the term used for water found underground?
Answer:
The term used for water found underground is ‘groundwater.’