Environmental Parasitology Question Paper

Environmental Parasitology

Course:Bachelor Of Science In Environmental Health

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE (ENVIRONMENTAL HEALTH)
HEH 108 ENVIRONMENTAL PARASITOLOGY
DATE: Tuesday 29th December, 2009 TIME: 2.00 p.m – 4.00 p.m
==================================================================================
INSTRUCTIONS:
Answer ALL the questions in Section I and Section 2 Part I and any two in Section 2
Part II. Total marks = 70. Section I (Total marks 20)

1. Define the following terms: [5 marks]
i) Parasite
ii) Host
iii)Vector
iv) Parasitism
v) Symbiosis

2.State the ways in which parasites cause harm to their and state an example for
each. [5 marks]

3.a)Explain the zoological method of classification. [3 marks]

b)Use a housefly to illustrate the classification method stated in (a) above.
[2 marks]

4.State the public health importance of each of the following parasites: [5 marks]
i) Fleas
ii) Lice
iii) Mites
iv) Black flies
v) Sand flies

Section 2 Part I

5. a) Outline the major characteristics of the three classes of helminthes.
[6 marks]

b) Outline the life cycle for each of the helminthes: hookworm, beef tapeworm.
[9 marks]

c) Outline the prevention and control of beef tapeworm. [5 marks]
Part II Answer any two (2) Questions ( 2x 15=30 marks)

6.a) Outline the characteristics used to distinguish hard and soft ticks.[5 marks]
b) Explain the public health importance of ticks. [5 marks]

c) Describe the control measures used for ticks. [5 marks]

7.a) State the scientific names of the following vectors and name one parasite
transmitted by each: [5 marks]
i) Cat flea
ii) Human lice
iii) Itch mite
iv) Sand flies
v) Tsetse flies

b) Outline the forms of myiasis in humans. [5 marks]

c) Describe the methods used for control of flies. [5 marks]

8. Schistosomiasis is important public health disease. Discuss the following:
a) Cause id Schistosomiasis [5 marks]
b) Life cycle [5 marks]
c) Prevention and control of Schistosomiasis. [5 marks]

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