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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
Page 1 of 2

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]

Page 2 of 2

Environmental Parasitology Question Paper

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