2014
ENVIRONMENTAL STUDIES
Full Marks: 75
Time: 3 hours
(The figures in the margin indicate full marks for the questions)
1. (a) Answer in one word: 1x5=5
1) Water segment of the environment.
2) Biotic components of ecosystem which can produce their food themselves.
3) Disease caused by the presence of excessive fluoride (> 1.50 ppm) in drinking water.
4) A protected area aimes at conservation of some animals where certain human activities are permitted.
5) Gas produced from microbial breakdown of solid waste.
(b) Fill in the blanks: 1x5=5
1) The process of accumulation of non-biodegradable substance in a body is called _______.
2) HIV is the short form of _______.
3) The UN Conference on human environment was held at _______ in 1972.
4) _______ is observed as ozone layer day every year.
5) The groups of biotic component of an ecosystem are producer, customer and _______.
(c) Choose the correct answer: 1x5=5
1) Most of the landslides occurring during rainy season are mainly natural/anthropogenic.
2) The great earthquake in Assam occurred in 1951/1895/1950.
3) From the mega biodiversity point of view, the position of India is 12th/11th/10th in the world.
4) Percentage of nitrogen (Vol/Vol) in the atmosphere is approx 21/78.
5) Solar energy is a renewable/non-renewable source of energy.
2. Distinguish between the following: 3x5=15
a) Rare and vulnerable species.
b) Weather and climate.
c) In-situ and ex-situ conservation of biodiversity.
d) Primary and secondary pollutants.
e) Troposphere and stratosphere.
3. Answer any three questions from the following:
a) What do you mean by natural resources? How are they classified? Give examples. 1+3+1=5
b) What is environment? What are the different segments of the environment? Discuss each of them briefly. 1+3+1=5
c) What do you mean by deforestation? Discuss the major causes and consequences of deforestation. 1+2+2=5
d) What is ecosystem? Discuss the basic structure of ecosystem. 1+4=5
e) Define the term biodiversity. Write a brief note on value of biodiversity. 1+4=5
4. Write short notes on any three of the following: 3x5=15
a) Rainwater harvesting.
b) Disaster management.
c) Noise pollution.
d) Dam-benefits and problems.
e) Chipko movement.
5. Answer any three questions from the following:
a) What do you mean by solid wastes? Discuss four important methods for their management. 1+4=5
b) What is water pollution? Discuss the main causes of water pollution. 1+4=5
c) What do you mean by sustainable development? Why is this concept so important today? 2+3=5
d) Explain the terms – food chain, food web and tropic level. 1+2+2=5
e) What are the mineral resources of Northeast India? Discuss the environmental problems associated with their over exploitation. 2+3=5
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