ENVIRONMENTAL ISSUES
2013 MARCH
NO QUESTIONS
2013 SAY
1. In a study conducted,
the concentration of DDT found to increase in the successive trophic levels.
The result of the study is shown below.
Name the
phenomenon. How does DDT accumulation in birds affect their population?
Explain. (4)
2014 MARCH
1.
An article in the newspaper reports that
‘Refrigerants like Chlorofluorocarbons (CFCs) pose threat to the environment.’
How CFCs are harmful to the environment? (2)
2014 SAY
1.
A pond near to your home was with excessive algal
bloom.
a.
What are the possible reasons for this? (2)
b.
What will be the level of BOD? (1)
c.
Write any one case study for integrated waste water
treatment. (1)
OR
The temperature
at New Delhi during April 2013 is 44.5o C. The earth’s temperature
is regularly increasing.
a.
What are the reasons for this? (2)
b.
Write your suggestions to control this phenomenon.
(2)
2015 MARCH
1.
An aquatic ecosystem having luxurious growth of cyanobacteria
(Algal bloom) leads to eutrophication.
(a) What kind
of pollutants cause algal bloom to colonize the aquatic ecosystem ‘?
(b) What are the
consequences of eutrophication? (Scores:
1 + 1 = 2)
2.
During the past century, the temperature of the
earth has increased by 0.6 °C, most of it during the last few decades. Rise in
temperature causes deleterious changes in the environment, thus leading to
increased melting of polar ice caps as well as other places like Himalayan snow
caps. Suggest any two control measures that will reduce global warming. (Scores : 1 + 1 = 2)
2015 SAY
1.
Observe the diagram and answer the following:
a.
Suggest the reasons for the presence of DDT in the
water.
b.
Fish eating birds of this area have higher DDT
concentration in their body. Justify.
c.
What will be the impact of DDT in the birds? (Scores:
1+1 + 2 =4)
OR
United Nations
Framework convention on climate change is an international treaty signed by 194
countries to cooperatively discuss global climatic change and its impact. As a
science student,
a.
What is global warming? (Score: 1)
b.
Explain the reasons and give suggestions to control
global warming. (Scores: 3)