HARD
Earn 100

What are impurities? Name the processes that remove soluble and insoluble impurities from water.

Important Questions on Pollution of Air and Water

MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution
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>Biology>Pollution of Air and Water>Water Pollution
To save the environment you have come across the words ''Reuse'' and ''Recycle''. What do they refer to?
MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution
Use of solar energy operated devices instead of LPG for preparation of food is an example of:
EASY
Science>Biology>Pollution of Air and Water>Water Pollution
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
Science>Biology>Pollution of Air and Water>Water Pollution
The presence of which microorganism in Ganga water indicates contamination?
MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution
Explain with three points how recycling waste materials help in maintaining ecological balance.
MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution
One student makes a kaleidoscope using pieces of coloured glass. Which 'R' he has used to protect the environment? 
EASY
Science>Biology>Pollution of Air and Water>Water Pollution
The three R’s to save the environment are
EASY
Science>Biology>Pollution of Air and Water>Water Pollution
The presence of following kind of bacteria in water indicates contamination by disease causing micro-organisms
HARD
Science>Biology>Pollution of Air and Water>Water Pollution
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?
MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution

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

MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution
Name the group of bacteria, found in human intestines, whose presence in water indicates contamination by diseases causing microorganisms?
EASY
Science>Biology>Pollution of Air and Water>Water Pollution
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. 
EASY
Science>Biology>Pollution of Air and Water>Water Pollution
Which radiation coming from the sun, is prevented by the Ozone layer from falling on the earth’s surface?
MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution
 “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
Science>Biology>Pollution of Air and Water>Water Pollution
Distilled water is _____ of the electricity.
EASY
Science>Biology>Pollution of Air and Water>Water Pollution

How will you reuse the waste water in your houses?

MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution
Mention any three adverse effects of fishing with chemicals.
MEDIUM
Science>Biology>Pollution of Air and Water>Water Pollution

Give the biological reasons for the following statement:

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

EASY
Science>Biology>Pollution of Air and Water>Water Pollution
What are the different uses of water?