POST GRADUATE DIPLOMA IN ENVIRONMENT AND SUSTAINABLE DEVELOPMENT (PGDESD)
O O
Term-End Examination December, 2012 MED-001 : UNDERSTANDING THE ENVIRONMENT
Time : 2 hours
Maximum Marks : 50
Note : All questions are compulsory.
1.
Answer any five of the following :
2x5=10
(a)
What is the importance of soil porosity ?
(b)
What is soil organic matter ? Explain its importance.
(c)
List any four primary pollutants emitted directly into the air.
(d)
List any 4 forms of energy.
(e)
How do aerosols affect cloud formation and precipitation ?
(f)
What are the four major factors that influence change in population density ?
MED-001
1
P.T.O.
2.
Attempt any two of the following : (a)
2x5=10
Briefly explain the different water quality parameters.
(b) What are tides ? How are they formed ? (c)
3.
What is global warming ? Describe its cause and effects.
Attempt any two of the following :
1+2+2
(a) What is parasitism ? List the different types of parasites. Explain the differences between them. (b) What is a biome ? List two characteristic 1+4 types of plants (based on growth form ) found in the following biomes : (i)
tropical rain forest
(ii) savannas (iii) warm deserts (iv) tundras (c) What are the three main types of coral reefs ? Where are they found ? Briefly explain their structure. MED-001
2
5
4.
5.
Attempt any two of the following : (a)
What do you understand by the terms 2+3 'bioaccumulation ' and biomagnification' ? With the help of suitable example, explain how these processes can become problematic ?
(b)
Distinguish between resilience and 2+3 resistance of an ecosystem. Why are ecosystems like tropical rainforests among the most resistant systems ?
(c)
Distinguish between geochemical and biogeochemical cycles giving suitable examples.
5
Attempt any two of the following : (a)
What are the harmful effects of 5 deforestation ?
(b)
List the major steps in cycling of nitrogen in an ecosystem.
5
(c)
How do various activities in an urban industrialised society affect the environment at local, regional and global levels ?
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