Envs120 Final Exam

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UNIVERSITY OF KWAZULU- NATAL
HOWARD COLLEGE
EXAMINATION : NOVEMBER 2010

SCHOOL: ENVIRONMENTAL SCIENCES
LEVEL: 1
MODULE: ENVIRONMENTAL SYSTEMS
CODE: ENVS120 H2
DURATION: 3 HOURSTOTAL MARKS : 100
__________________________________________________________________

INTERNAL EXAMINERS: Mr N Njoya
Mr J Lutchmiah
EXTERNAL EXAMINER: Dr O Mutanga
______________________________________________________________________

ANSWER EACH SECTION IN A SEPARATE ANSWER BOOK

_______________________________________________________________________

SECTION A : Atmospheric and Hydrospheric Processes (50 MARKS)

ANSWER EITHER QUESTION 1 OR 2 (25 marks)

1Explain, with the aid of a diagram, the role of the Hydrological Cycle in the conversion of a meager supply of water to a more generous one. (25)

2Discuss the various types of floods with particular reference to magnitude, climate and environmental impacts. (25)

ANSWER EITHER QUESTION 3 OR 4 (25 marks)

3Explain, with the aid of a diagram, the vertical layered structure of the atmosphere. (25)

4Discuss the various causes and consequences of global warming. (25)

SECTION B : Biospheric and Lithospheric Processes (50 MARKS)

ANSWER QUESTION 5 AND ANY TWO FROM OUESTIONS 6 TO 9 (25 Marks)

5Describe and explain continental shape and Earth’s structure as evidence of continental drift. (5)

6What processes lead to the formation of volcanoes? With the help of sketch diagrams, describe and discuss two intrusive landforms of volcanicity. (10)

7Provide a detailed definition of rock weathering and explain its role in the rock cycle. (10)

8Briefly explain how metamorphic rocks are formed and discuss two types of rock metamorphism providing examples. (10)

9The formation of soil is influenced by several factors. Explain the role of five known factors that contribute to this process. (10)

ANSWER QUESTION 10 AND ANY TWO FROM OUESTIONS 11-14 (25 Marks)

10Define the biosphere and briefly explain how it interacts with the other three “spheres” as considered in this course. (5)

11Discuss the plant species included in the human diet in terms of diversity, origin, and how their uses and spread have changed historically. (10)

12List the branches of ecology in the order of increasing spatial scale, briefly discuss their content and approaches, and specify which ones incorporate abiotic components of the environment. (10)

13List the major human-induced causes for loss of ecosystem function and species extinctions, provide relevant examples in each case, and discuss how they are likely to change in the near future. (10)

14List the world’s major terrestrial biomes, mentioning their geographic distribution (globally), the environmental factors limiting plant growth in each one of them, and the current threats they face. (10)

UNIVERSITY OF KWAZULU- NATAL
HOWARD COLLEGE
EXAMINATION : SUPPLEMENTARY 2010

SCHOOL: ENVIRONMENTAL SCIENCES
LEVEL: 1
MODULE: ENVIRONMENTAL SYSTEMS
CODE: ENVS120 H2
DURATION: 3 HOURSTOTAL MARKS : 100
__________________________________________________________________

INTERNAL EXAMINERS: Mr N Njoya
Mr J Lutchmiah
EXTERNAL EXAMINER: Dr O Mutanga
______________________________________________________________________

ANSWER EACH SECTION IN A SEPARATE ANSWER BOOK

_______________________________________________________________________

SECTION A : Atmospheric and Hydrospheric Processes (50 MARKS)

ANSWER EITHER QUESTION 1 OR 2 (25 marks)

1Discuss, globally, the use of surface and ground water for agricultural, industrial and domestic/municipal activities. (25)

2The occurrence of a particular type of precipitation is subject to the prevalence of certain conditions. Explain the conditions that influence the different types of precipitation. (25)

ANSWER EITHER QUESTION 3...
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