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Earn 100

Complete the table.

Troposphere layer Stratosphere layer Mesosphere layer Thermosphere layer Exosphere layer
  *This layer extends from 16km to 50 km      
        May satellites orbit at this layer
Air pressure is the highest at this layer.        
      The space shuttle orbits at this layer  

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
​​​​​The ozone layer forms a shield over the Earth's atmosphere and blocks harmful _____.
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Science>Chemistry>Air Around Us>Presence of Air Around Us

Rohit took a deep breath and blew into a flat paper bag to make it puff up. What does this show?

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Science>Chemistry>Air Around Us>Presence of Air Around Us
Look at the given picture of the different layers of the atmosphere and label it. Also mention the role of each layer.
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