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D-89-11 P.T.O.
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D
PAPER-III
[Maximum Marks : 200Time : 2 1/2 hours]
Number of Pages in this Booklet : 32 Number of Questions in this Booklet : 19
Instructions for the Candidates ¯Ö¸üßõÖÖÙ£ÖµÖÖë Ûêú ×»Ö‹ ×®Ö¤ìü¿Ö
(In figures as per admission card)
ENVIRONMENTAL SCIENCE
8 9 1 1
D-89-11 2
ENVIRONMENTAL SCIENCE
PAPER – III
Note : This paper is of two hundred (200) marks containing four (4) sections. Candidates
are required to attempt the questions contained in these sections according to the
detailed instructions given therein.
Answer to all questions must be written in English only.
D-89-11 3 P.T.O.
SECTION – I
Note : This section consists of two essay type questions of twenty (20) marks each, to be
answered in about five hundred (500) words each. (2 ×××× 20 = 40 Marks)
1. Write an essay on :
Principle and Applications of chromatography in environmental science.
OR Conservation of wetlands.
OR Bio-Energy. OR
Methodologies of Environmental Impact Assessment.
OR
Multiple regression technique and its application in environmental data analysis.
OR
Applications of GIS and Remote Sensing in water resource management.
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D-89-11 7 P.T.O.
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2. Write an essay on :
Sources and effects of unsaturated and saturated hydrocarbons in the atmosphere.
OR Environmental Ethics and Global imperatives.
OR Recent trends in Biodiversity conservation.
OR Pros and cons of Genetically modified plants.
OR Jurisdiction and powers of National Environmental Appellate Authority.
OR Role of soil microorganisms.
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D-89-11 11 P.T.O.
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SECTION – II
Note : This section contains three (3) questions of fifteen (15) marks each, to be answered
in about three hundred (300) words. (3 ×××× 15 = 45 Marks)
3. Discuss the criteria employed for dispersal of pollutants in marine ecosystems.
4. Discuss ‘Nitrogen Cycle’ and its significance.
5. Describe the operation of an effluent treatment plant.
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SECTION – III
Note : This section contains nine (9) questions of ten (10) marks each, to be answered in
about fifty (50) words. (9 ×××× 10 = 90 Marks)
6. Define aerodynamic diameter of an aerosol particle. How do the aerosol particles
influence climate ?
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7. Define phytoremediation. With suitable examples distinguish between
phytoextraction and phytostabilization.
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8. The molar extinction coefficient of X-iodine complex at 450 nm is 0.2. Determine the
concentration of X in a solution of the iodine complex which has an absorbance of
0.38 in a 1 cm cuvette.
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9. Describe the principle of Ocean Thermal Energy Conversion (OTEC).
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10. Distinguish between El Nino and La Nina effects.
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11. What is Red Data Book ? Explain its significance.
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12. Explain the terms “precipitation” and “water table”.
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13. Differentiate between adiabatic lapse rate and environmental lapse rate.
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D-89-11 26
14. Compare “Pyramid of numbers” for pond and tree ecosystems.
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SECTION – IV
Note : This section contains five (5) questions of five (5) marks each based on the following
passage. Each question should be answered in about thirty (30) words.
(5 ×××× 5 = 25 Marks)
Some years ago, the Arogya Health Service sent supplier of DDT to Karkala to
control mosquitoes that were spreading malaria among the people. As the DDT was
sprayed, the mosquitoes were quickly wiped out. But there were thousands of lizards
in the village that ate these mosquitoes (which had absorbed the sprayed DDT) and
D-89-11 27 P.T.O.
they, in turn, kept accumulating the DDT in their bodies. When these lizards ate
mosquitoes, they retained a lot of the DDT in their body. Due to the excessive
accumulation of DDT in their bodies, the lizards became inactive and slow. This
made if easier for cats to catch the lizards, one of their favourite food. At about the
same time, people also found hordes of caterpillars on the roofing materials of their
homes. They realised that the lizards, which had previously kept the caterpillar
population under control, were now being eaten by the cats. And now, all over
Karkala, the cats that ate the lizards died from DDT poisoning. Then rats moved in
because there were no cats to control their population. With the rats came a new
danger, plague. Officials sent out emergency calls for cats, which were sent in by
Aeroplane and dropped by Parachute.
15. How did one small act of humans (spraying of DDT) disturb the balance of the
ecosystem ?
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16. How did absence of mosquitoes affected outburst of plague ?
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17. How did roofing material get spoiled in Karkala ?
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18. How did cats that ate the lizards die ?
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19. What inference you draw from the above passage ?
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Question
Number
Marks Obtained
FOR OFFICE USE ONLY
Total Marks Obtained (in words) ...........................................
(in figures) ..........................................
Signature & Name of the Coordinator ...................................
(Evaluation) Date .........................
D-89-11 32
Marks
Obtained