Ensc 204: Global Ecosystems Question Paper
Ensc 204: Global Ecosystems
Course:Bachelor Of Environmental Science
Institution: Chuka University question papers
Exam Year:2013
CHUKA
UNIVERSITY
UNIVERSITY EXAMINATIONS
SECOND YEAR EXAMINATION FOR THE AWARD OF DEGREE OF
BACHELOR OF SCIENCE (ENVIRONMENTAL SCIENCE)
ENSC 204: GLOBAL ECOSYSTEMS
STREAMS: BSC. (ENSC) Y2S2 TIME: 2 HOURS
DAY/DATE: TUESDAY 6/8/2013 8.30 A.M. – 10.30 A.M.
INSTRUCTIONS:
SECTION A (30 MARKS) ANSWER ALL QUESTIONS.
1. Define the following terms: [5 marks]
(a) Niche
(b) Residence time
(c) Total photosynthesis
(d) Keystone species
(e) Macronutrients
2. Differentiate between the following:
(a) Ecosystem and ecotone [2 marks]
(b) Population and community [2 marks]
3. Briefly discuss types of food chains. [2 marks]
4. List the major sinks of carbon in the environment. [4 marks]
5. What is the importance of fire in the savannah ecosystem? [5 marks]
6. Outline the differentiating characteristics of aquatic ecosystems. [4 marks]
7. With a well labeled diagram briefly discuss the structure of a deep tropical lake.
[6 marks]
SECTION B (40 MARKS) ANSWER ANY TWO QUESTIONS
8. Discuss how the hydrological cycle can be disrupted by human activities. [20 marks]
9. Discuss the measure that can be used to protect natural ecosystems. [20 marks]
10. Discuss the characteristics of modified ecosystems. [20 marks]
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