Necessity of Water


Water and Its Importance I - Concepts
Class - 6th ISO Subjects
 
 
Concept Explanation
 

Necessity of Water

Water available for use-about three –fourth of the earth surface is covered with water that is why it is also called the water planet. About three-fourths of the earth’s surface is covered with water. Water is found in puddles, ponds, rivers, lakes and oceans. It is present under the ground and in glaciers in the form of ice. It is also present in air in the form of water vapour.

  • 1) 97.40% of the available water is in seas and oceans which cannot be directly used by us because of its high salt content. A lot of fresh water is frozen in glaciers and in the polar ice caps. Thus, only 0.01% of the water on the earth is available to us for consumption.
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    Sample Questions
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    Question : 1

    Assertion (A) : Water is essential for living beings.

    Rease (R) : Water known as Elixir of life.

    Right Option : B
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    Question : 2

    Which of the following are correct :

    (a) In the human body, processes like digestion, circulation and excretion are largely regulated with the help of water.

    (b) In the absence of water, plant and animal cells cannot survive.

    (c) An aqueous medium is required to carry out all the metabolic reactions in the body.

    Right Option : D
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    Question : 3

    In which of the following case evaporation of water will be slowest?

    Right Option : C
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