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Hydrobiology Question Paper

Hydrobiology

Course:Bachelor Of Education Science

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
EDUCATION AND BACHELOR OF SCIENCE
SZL 204: HYDROBIOLOGY

DATE: TUESDAY, 22ND DECEMBER 2009

TIME: 8.00 A.M. - 10.00 A.M.

INSTRUCTIONS: Answer
ALL questions in section A and any ONE

question from Section B. Illustrate your answers and give
examples
where
appropriate.

SECTION A: Answer ALL questions.
1.
Explain the effect of pressure on the distribution of aquatic organisms.
2.
Outline the classification of lakes based on their productivity.
3.
“Fishes are the most important vertebrates in aquatic environments”. Explain this statement.
4.
Describe briefly the zones that are created when raw sewage is released in a lotic environment.
5.
Explain the term “Bioinvasion” giving three examples from Kenyan waterbodies.
6.
Describe briefly the methods used in controlling aquatic weeds.
7.
Outline factors that determine the distribution of benthos.
8.
Illustrate vertical migration in the zooplankton Calanus sp

SECTION B: Answer any ONE Question (30 Marks)
9.
Write an essay on the physical properties of water.
10.
Discuss the ecological changes that have occurred in Lake Victoria during the last 20 years.
11.
Discus the transmission of human water-borne diseases.