Major Domains of Earth

NCERT Exercise Solution:

Fill in the blanks:

  1. The deepest point on the earth is _____________ in the Pacific Ocean.

    Answer: Mariana Trench
  2. The _____________ Ocean is named after a country.

    Answer: Indian
  3. The _____________ is a narrow contact zone of land, water and air that supports life.

    Answer: Biosphere
  4. The continents of Europe and Asia together are known as _____________.

    Answer: Eurasia
  5. The highest mountain peak on the earth is _____________.

    Answer: Mount Everest

Tick the correct answers

The mountain range that separates Europe from Asia is

  1. the Andes
  2. the Himalayas
  3. the Urals

    Answer: (c) the Urals

The continent of North America is linked to South America by

  1. an Isthmus
  2. a Strait
  3. a Canal

    Answer:(a) an Isthmus

The major constituent of atmosphere by per cent is

  1. Nitrogen
  2. Oxygen
  3. Carbon dioxide

    Answer: (a) Nitrogen

The domain of the earth consisting of solid rocks is

  1. the Atmosphere
  2. the Hydrosphere
  3. the Lithosphere

    Answer: (c) the Lithosphere

Which is the largest continent?

  1. Africa
  2. Asia
  3. Australia

    Answer: (b) Asia

Answer Thse Questions

What are the four major domains of the earth?

Answer: The four major domains of the earth are; Lithosphere, Hydrosphere, Atmosphere and Biosphere.

Name the major continents of the earth.

Answer: Asia, Africa, North America, South America, Australia and Antarctica

Name the two continents that lie entirely in the Southern Hemisphere.

Answer: Australia and Antarctica

Name the different layers of atmosphere.

Answer: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere

Why is the earth called the ‘blue planet’?

Answer: More than 71% of the earth’s surface is covered with water. Due to this, the earth appears blue when seen from the space. Hence, the earth is called the ‘blue planet’.

Why is the Northern Hemisphere called the Land Hemisphere?

Answer: A major portion of the landmass of the earth is present in the northern hemisphere. Hence, the Northern Hemisphere is called the Land Hemisphere.

Why is the Biosphere important for living organisms?

Answer: Biosphere is the narrow zone of contact between lithosphere, hydrosphere and atmosphere. There is constant interaction among the three domains of earth; in this zone. This interaction makes life possible. Thus, biosphere is important for living organisms.


EXTRA QUESTIONS

Which is the smallest continent?

Answer: Australia

Which is the largest ocean?

Answer: Pacific Ocean

What is the significance of indented coastline in the Atlantic Ocean?

Answer: The indented coastline in the Atlantic Ocean means the coastline is ideal for natural harbours and ports. Hence, the Atlantic Ocean is the busiest ocean from commercial point of view.

What happens when the level of carbon dioxide increases in the atmosphere?

Answer: When the level of carbon dioxide increases in the atmosphere, it results in increased temperature throughout the world. This is known as global warming.

What is the importance of carbon dioxide for us?

Answer: Importance of carbon dioxide:

  1. Plants need carbon dioxide to make food.
  2. Carbon dioxide helps in maintaining ambient temperature on earth because carbon dioxide traps solar radiation.

Which major latitudes pass through Africa?

Answer: Following major latitudes pass through Africa:

  1. Tropic of Cancer
  2. Equator
  3. Tropic of Capricorn

Which continent is known as the island continent? Why?

Answer: Australia is surrounded by ocean from all sides. Hence, it is known as the island continent.

Write a brief note on the Indian Ocean.

Answer: Indian Ocean is the only ocean to be named after a country. This ocean is almost triangular in shape. Asia is towards north, Africa is towards west and Australia is towards east of this ocean.

Write a brief note on Asia.

Answer: Asia is the largest continent. It covers about one-third of the total land area of the earth. This continent lies in the eastern hemisphere. The Tropic of Cancer passes through Asia. The Ural Mountain separates Asia from Europe in the west. The combined landmass of Europe and Asia is called Eurasia.



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