Environmental Biology And Ecology Question Paper

Environmental Biology And Ecology

Course:Bachelor Of Environmental Science

Institution: Kabarak University question papers

Exam Year:2010

KABARAK UNIVERSITY
UNIVERSITY EXAMINATIONS
2009/2010 ACADEMIC YEAR
FOR THE DEGREE OF BACHELOR OF ENVIRONMENTAL SCIENCE
COURSE CODE: ENVS 222
COURSE TITLE: ENVIRONMENTAL BIOLOGY AND ECOLOGY
STREAM: Y2S2
INSTRUCTIONS:
Answer ALL questions in SECTION A and any TWO in SECTION B

SECTION A: (40 MARKS)
1. Briefly explain why the following are important in ecosystems.
(a) Carbon cycle
(b) Nitrogen cycle
(c) Predators
(d) Dominant plants (8 marks)
2. Illustrate and describe energy flow in an ecosystem. (8 marks)
3. Describe the different types of coasts. (8 marks)
4. Explain how the following factors affect the biotic life in acquatic environments.(8 marks)
(i) Salinity
(ii) Currents
(iii) Temperature
(iv) Body Shape
5. (a) What is Biodiversity? (2 marks)
(b) Explain how the following factors affect biodiversity in an ecosystem
(i) Habitat destruction. (2 marks)
(ii) Exotic species introduction (2 marks)
(iii) Pollution (2 marks)

SECTION B (20 MARKS)
6. Discuss the different types of marine ecosystems. (10 marks)
7. Discuss the species diversity in the following zones of lake environments
a) Littoral zone
b) Limnetic zone
c) profudal zone (10 marks)
8. Discuss adaptations of animals to the following terrestrial environments
a) Desert (5 marks)
b) Tundra (5 marks)

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