MEDIUM
Earn 100

State the uses of nitrogen and oxygen.

Important Questions on Natural Resources-Air,Water and Land

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Science>Chemistry>Natural Resources-Air,Water and Land>Air
Explain with three points how recycling waste materials help in maintaining ecological balance.
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Science>Chemistry>Natural Resources-Air,Water and Land>Air
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>Natural Resources-Air,Water and Land>Air
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.
MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Mention any three adverse effects of fishing with chemicals.
HARD
Science>Chemistry>Natural Resources-Air,Water and Land>Air
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>Natural Resources-Air,Water and Land>Air

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

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Science>Chemistry>Natural Resources-Air,Water and Land>Air
Use of solar energy operated devices instead of LPG for preparation of food is an example of:
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
The presence of following kind of bacteria in water indicates contamination by disease causing micro-organisms
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air

How will you reuse the waste water in your houses?

MEDIUM
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Name the group of bacteria, found in human intestines, whose presence in water indicates contamination by diseases causing microorganisms?
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
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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 “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>Natural Resources-Air,Water and Land>Air
The three R’s to save the environment are
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Science>Chemistry>Natural Resources-Air,Water and Land>Air
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>Natural Resources-Air,Water and Land>Air
To save the environment you have come across the words ''Reuse'' and ''Recycle''. What do they refer to?
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Science>Chemistry>Natural Resources-Air,Water and Land>Air

Give the biological reasons for the following statement:

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

EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air
Which radiation coming from the sun, is prevented by the Ozone layer from falling on the earth’s surface?
EASY
Science>Chemistry>Natural Resources-Air,Water and Land>Air

Look at the chart carefully and answer the question that follows.

Question Image 

The gas that constitutes 0.9% of the air is?

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Science>Chemistry>Natural Resources-Air,Water and Land>Air
Oxygen is the biggest component of air.
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Air is a mixture of many _____.