Exercises & Solutions :: Questions and Answers.
1.Question. Answer the following questions briefly.
(a) What are the four major domains of the earth?
Answer. The four domains of the earth are:
(1) Lithosphere. (2) Hydrosphere. (3) Atmosphere.
(4) Biosphere.
(b) Name the major continents of the earth?
Answer.The major continents of the earth are:
Asia, Africa, Europe, Notrth America, South America, Australia and Antarctica
(c) Name the two continents that lie entirely in the Southern Hemisphere.
Answer. The two continents that lie entirely in the Southern Hemisphere are:
1. Australia.
2. Antarctica.
(d) Name the different layers of the atmosphere.
Answer. The differnt layers of the atmosphere are:
Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
(e) Why is the earth called the blue planet'?
Answer. More trhan 71 percent of the earth is covered with water.
Therefore , from outer space it appears blue. That is why, it is called blue planet.
(f) Why is the Northern Hemisphere called land Hemisphere.
Answer. The greater part of the land masses lie in the Northern Hemisphere.
(g) Why is the biosphere important for the living organisms?
Answer. The biosphere is the narrow zone of contact between land, water and air. It is in this zone that life that is unique to the planet exists. The growth and survival of the biosphere is made possible by the transfer of energy and matter between elements of the environment.
2.Question.Tick the correct answer.
(a)The mountain range that separates Europe from Asia is
(i) the Andes. (ii) the Himalays. (iii) the Ural.
Answer. (iii) the Ural.
(b) The continent of north America is linked to South America by
(i) Isthmus. (ii) Strait. (iii) Suez canal.
Answer. i) Isthmus.
(c) The major constituent of atmosphere by percent is
(i) Nitrogen. (ii) Oxygen. (iii) Carbon dioxide.
Answer. (i) Nitrogen.
(d) The domain of the earth consisting of solid rocks is
(i) the Atmosphere. (ii) the Hydrophere. (iii) the Litosphere.
Answer. (iii) the Litosphere.
(e) Which is the largest continent?
(i) Africa. (ii) Asia. (iii) Australia.
Answer. (ii) Asia.
3.Question. Fill in the blanks.
(a)The deepest point on the earth is Mariana Trench in the Pacfic ocean.
(b) The Indian Ocean is named after a country.
(c) The Biosphere is the narrow contact zone of land, water and air that support life.
(d) The continents of Europe and Asia together are known as Eurasia.
(e) The highest mountain peak on the earth is Mt. Everest.
