EASY
Earn 100

What are arboreal animals? Give two examples. 

Important Questions on Organisms and Habitat

MEDIUM
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Explain with three points how recycling waste materials help in maintaining ecological balance.
MEDIUM
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Use of solar energy operated devices instead of LPG for preparation of food is an example of:
EASY
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Which radiation coming from the sun, is prevented by the Ozone layer from falling on the earth’s surface?
MEDIUM
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Mention any three adverse effects of fishing with chemicals.
EASY
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How will you reuse the waste water in your houses?

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

MEDIUM
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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.
EASY
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The presence of following kind of bacteria in water indicates contamination by disease causing micro-organisms
MEDIUM
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Name the group of bacteria, found in human intestines, whose presence in water indicates contamination by diseases causing microorganisms?
MEDIUM
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To save the environment you have come across the words ''Reuse'' and ''Recycle''. What do they refer to?
EASY
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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. 
MEDIUM
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Give the biological reasons for the following statement:

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

MEDIUM
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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.
EASY
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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?
EASY
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The three R’s to save the environment are
MEDIUM
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One student makes a kaleidoscope using pieces of coloured glass. Which 'R' he has used to protect the environment? 
HARD
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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?
EASY
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What are modified as tusks, in elephants ? 
EASY
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Fill in the blank choosing the options given in the bracket:

An adult person has 32 teeth. Out of these, four are: _____ [incisors/canines].

EASY
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Fill in the blank with a suitable word from the bracket:

Animals that grow up feeding on their mother's milk are called _____ (Amphibians/Reptiles/Mammals).