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प्रश्न
Why is water very precious for all living being ?
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उत्तर
Water is one of the most precious substances for the existence of life. Since life on the earth began in the oceans, and since no living thing can survive without water, it is rightly called the source of life.
Water forms a large part of the body mass of all living organisms — 90% of human blood is water. Water has the ability to dissolve a number of substances. Therefore, it serve as the liquid medium in which all reactions within the living body take place.
Fruits and vegetables contain water in them. Even dry-looking substances like wood, peas, beans, grams, etc., contain some amount of water.
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संबंधित प्रश्न
State the importance of water cycle in nature.
Give balanced chemical equation for the reaction of water with Carbon dioxide.
Water exists in all three states. Discuss.
Explain why:
Air dissolved in water contains a higher proportion of oxygen.
What do you understand by soft water?
Define ‘eutrophication’.
State the importance of water for all general uses.
Match the terms in List I with the correct answers in List II.
| List I | List II |
| 1. Solubility in a given solvent decreases with an increase in temperature. | A: Na2SO4.10H2O |
| 2. A white efflorescent crystal | B: NaOH |
| 3. A hygroscopic dehydrating agent | C: Ca(HCO3)2 |
| 4. A deliquescent alkali | D: conc. H2SO4 |
| 5. A substance present in temporary hard water | E: CaSO4 |
A jumbled word is given here. Write the correct form of the word.
WOSN
Write any two activities which require more than a bucket of water.
