ENVIRONMENTAL ISSUES
2010 MARCH
1. Destruction of forest leads to the
increase of CO2 in atmosphere. Recently Govt. of India instituted an
award for individuals or communities from rural areas that shown extraordinary
courage and dedication in protecting wildlife.
a. Identify the award.
b. Comment on deforestation and
reforestation. (2)
2. Industrial effluents and domestic sewage
seriously affect fresh water bodies. For protecting aquatic life Govt. of India
recently declared an animal as national aquatic animal.
a. Identify the animal.
b. Distinguish biomagnification from
eutrophication. (2)
2010 SAY
1. In 1990s, Delhi ranked 4th
among the most polluted cities of the world. But now air quality of Delhi has
significantly improved mainly of switching vehicles from diesel to CNG.
a. Expand CNG.
b. CNG is better than diesel. Comment. (2)
2. Greenhouse effect is a naturally
occurring phenomenon that is responsible for heating of earth’s surface and
atmosphere.
a. Explain greenhouse effect.
b. What will happen if there is absolutely
no green-house effect over earth’s surface? (2)
2011 MARCH
1. Arrange the following words into suitable
categories in the given table.
Algal
bloom, Catalytic converter, Eichhornia, Electrostatic precipitator (2)
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Air pollution
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Water pollution
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2. Geetha resides in a city nearby a lake.
Water from this lake was used for various domestic purposes earlier.
Now-a-days, this water become turbid and is with an unpleasant odour.
a. What can be the reason for this?
b. Name the scientific term that explains
this effect. (2)
2011 SAY
1. As Head of the Vehicle Department, issue
a notice to vehicle owners to observe any two measures to reduce vehicular air
pollution and record the merits and demerits of CNG. (3)
2. Global warming is alarming in the world
due to the increase in greenhouse gases. Name two greenhouse gases. (1)
2012 MARCH
1.
The increased use of chemicals like CFCs (Chloro
fluro carbons) causes adverse ecological impacts. Why CFCs are considered
harmful to the environment? (2)
2.
Meera, an environmental activist, noticed a gradual
decline in the population of birds in the open agricultural fields near her
place. She has heared of the excessive use of pesticides like DDT around that
area.
a.
What might have led to the decline of bird
population in that area?
b.
Name the process that has caused this phenomenon.
(2)
2012 SAY
1. Ammu read in the newspaper that BOD of a
water body in a nearby village was high and there is algal bloom.
a. What is BOD?
b. What is algal bloom?
c. Can you give possible reason for these
phenomena? (2)
2. Prakash parked his car in bright sunlight
for a few hours, with glass windows fully raised. After sometime inside of the
car was very hot.
a. Name the phenomenon.
b. How can you correlate this phenomenon
with global warming? (2)