Science grade 06(English Medium)

Chapter-03

WATER AS A NATURAL RESOURCE

• Water exists as three physical states as solid, liquid and gas.
• Precipitation, surface water and ground water are the three ways that water exists.
• Further, according to the salinity water can be divided in to three types as fresh water, brackish water and marine water.
• Although water covers 70% of the earth surface, the consumable amount of water is 0.01%.

Assignment 01.

Section A

1.What are three states of water? Mention two examples for each.

02.Write down the experimental steps to find the states of water.

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03.Mention two functions of water vapors

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04.What are the three categories of water found in the environment? Give two examples
for each.
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05.Based on the salinity, water can be divided in to three types. Mention each with 2
 examples

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06.What do you mean by water pollution? Give four methods of water pollution.

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Section B

01.Fill in the blanks with correct ward

• When liquid water is heated, it can be converted in to…………………...............
• Snow is an example for the………………………………state of water.
• Sleet that is fallen to the earth is one of the type of……………………………...
• Water in ponds is one of the type of………………………………………………
• Almost two point five percent of the water on the earth surface is…………water.
• Brackish water can be found in……………………............
• Agro chemicals……………………………..pure water.
• By cooling vapor……………………..…..can be obtained
• Water is an important factor to plants for…………………………………
• Marine water accounts for………………….of the total water on the earth.

02.You are given three test tubes A,B, & C so as the final volume up to 50 ml.Salt in
B & C are dissolved well.

• A-50 ml of water
• B-3 grams of salt + water
• C-7 grams of salt + water

A           B              C

i.Arrange the test tubes in ascending order by considering the masses
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ii.Which test tube can be assumed as marine water? Explain your answer
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iii.What is the test tube that can be assumed as brackish water? Explain your answer
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iv.What is the conclusion that can be taken from the above activity?
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03.Describe an experiment to show that the atmosphere consists of water vapors with a 
diagram.
Write two instances in our day to day life.
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Sanjaya Sir..