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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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Ensc 204: Global Ecosystems Question Paper

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