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EBM811S - ENVIRONMENTAL BIOLOGY AND AQUATIC ECOSYSTEM MANAGEMENT - 2ND OPP - JULY 2022 |
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NAMIBIA UNIVERSITY
OF SCIENCE AND TECHNOLOGY
FACULTY OF HEALTH, APPLIED SCIENCES AND NATURAL RESOURCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION: BACHELOR OF SCIENCE HONOURS
QUALIFICATION CODE: O8BOSH
COURSE CODE: EBM811S
SESSION: JULY 2022
LEVEL: 8
COURSE NAME: ENVIRONMENTAL
BIOLOGY AND AQUATIC ECOSYSTEM
MANAGEMENT
PAPER: THEORY
DURATION: 3 HOURS
MARKS: 100
SUPPLEMENTARY / SECOND OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER (S): | Dr. Edosa Omoregie
MODERATOR:
Dr. Naftal Gabriel
INSTRUCTIONS
1. Answer all questions
2. Write clearly and neatly
3. Number your answers clearly
PERMISSIBLE MATERIAL
Scientific Calculator
THIS QUESTION PAPER CONSIST OF 3 PAGES
(Including this front page)
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Question 1
[20]
a) Give the orders of the following aquatic insects.
(9)
A CUTAN OL T ET
CsAE sPTATTS h+ls E atc Des ei .
D
mesothoracic
spiracle
ISN
Be
pya“y2ae
CS:LI pe
E
€3 GnAy x Ty
G
5 MEsiRE NORA OR TS
H
b) i. The diagram below is the head of a fish showing its mouthpart. What type of mouth
part is this fish having?
(2)
lachrymal area _
en
(2)
c). Identify the parts labeled as A, B, C, D, E, F and G in the above illustration of remote
sensing used in the management of wetland resources.
(7)
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Question 2
[20]
a) In atabular form only, explain the main differences between a lotic and a lentic aquatic
system.
(10)
b) With reference to physical and biological properties, discuss the erosional and
depositional ecological habitat types of the river system.
(10)
Question 3
[20]
a) Briefly describe the following processes and their application in the treatment of
wastewater:
(6)
i. Sedimentation
ii. Filtration
iii. Disinfection
b) What is cultural eutrophication? Discuss the effect of cultural eutrophication on the
physical, chemical and biodiversity of aquatic environment.
(14)
Question 4
[20]
Living organisms play an important role in the recycling of many elements within an
ecosystem. Discuss how bacteria and their biochemical reactions contribute to the recycling
of nitrogen in the aquatic ecosystem.
(20)
Question 5
[20]
a) Review the various criteria for the designation of wetlands of international importance
based on The Ramsar Convention Guidelines.
(10)
b) Explain the term aquaponic and its ecological importance. Briefly discuss the benefits of
aquaponic to the sustenance of the environment.
(10)