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 Air is not visible but its presence can be felt. How do you know that air is in your surroundings? Write 3 experiences about it. 
 

Important Questions on Air Around Us

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Science>Chemistry>Air Around Us>Presence of Air Around Us
Explain with three points how recycling waste materials help in maintaining ecological balance.
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Science>Chemistry>Air Around Us>Presence of Air Around Us
One student makes a kaleidoscope using pieces of coloured glass. Which 'R' he has used to protect the environment? 
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Science>Chemistry>Air Around Us>Presence of Air Around Us
An environmentalist on a visit to your school suggested various methods to save the environment.
a) What does the term ‘Reduce’ refer to?
b) List any two advantages of water harvesting.
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Science>Chemistry>Air Around Us>Presence of Air Around Us
Mention any three adverse effects of fishing with chemicals.
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Science>Chemistry>Air Around Us>Presence of Air Around Us
What is the importance of reduce, recycle and reuse to save the environment? What changes can you make in your habits to become more environment-friendly?
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Science>Chemistry>Air Around Us>Presence of Air Around Us

What do you mean by the three R's to save the environment? Write in brief.

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Science>Chemistry>Air Around Us>Presence of Air Around Us
Use of solar energy operated devices instead of LPG for preparation of food is an example of:
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Science>Chemistry>Air Around Us>Presence of Air Around Us
The presence of following kind of bacteria in water indicates contamination by disease causing micro-organisms
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Science>Chemistry>Air Around Us>Presence of Air Around Us

How will you reuse the waste water in your houses?

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Science>Chemistry>Air Around Us>Presence of Air Around Us
Name the group of bacteria, found in human intestines, whose presence in water indicates contamination by diseases causing microorganisms?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
Everyone of us can do something to reduce our consumption of various natural resources. List any two such activities based on the 3-R approach. 
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Science>Chemistry>Air Around Us>Presence of Air Around Us
 “A lot of indiscriminate activities of humans pollute the environment”- Support the statement by giving three examples in favour of it. Give examples of a national park and a biosphere reserve in West Bengal.
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Science>Chemistry>Air Around Us>Presence of Air Around Us
The three R’s to save the environment are
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Science>Chemistry>Air Around Us>Presence of Air Around Us
The following very short answer type question of 2 marks may be answered in a few words or few sentences or as may be required:
Why is better to 'Re-use' the things?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
To save the environment you have come across the words ''Reuse'' and ''Recycle''. What do they refer to?
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Science>Chemistry>Air Around Us>Presence of Air Around Us

Give the biological reasons for the following statement:

Water pollution is a major cause of concern in our country.

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Science>Chemistry>Air Around Us>Presence of Air Around Us
Which radiation coming from the sun, is prevented by the Ozone layer from falling on the earth’s surface?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
What substance is present in a bottle which appear to be empty? Explain why, Earthworms come out of the soil only during heavy rains?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
What name is given to the layer of air which surrounds the Earth?
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Science>Chemistry>Air Around Us>Presence of Air Around Us
What is the layer of air around the Earth called?