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MAB702S-MARINE BIOLOGY 3B-JAN 2020 |
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NAMIBIA UNIVERSITY
OF SCIENCE AND TECHNOLOGY
FACULTY OF HEALTH AND APPLIED SCIENCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATION CODE: 07BOSC
COURSE NAME: MARINE BIOLOGY 3B
SESSION: JANUARY 2020
DURATION: 3 HOURS
LEVEL: 7
COURSE CODE: MAB702S
PAPER: THEORY
MARKS: 100
SUPPLEMENTARY / SECOND OPPORTUNITY EXAMINATION QUESTION PAPER
EXAMINER (S): | Prof. Edosa Omoregie
MODERATOR:
Dr. Johannes litembu
INSTRUCTIONS
Answer all questions in Sections A and B
Answer any three (3) questions in Section C
Write clearly and neatly
Number your answers correctly
PERMISSIBLE MATERIAL
Scientific Calculator
THIS EXAMINATION QUESTION PAPER CONSISTS OF 5 PAGES
(Including this front page)
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SECTION A (MULTIPLE CHOICE QUESTIONS): ANSWER ALL QUESTIONS
[25]
1. The diagram below is an illustration of the black mussel. State the Genus, Class and
Phylum the organism below to? Explain the major reason for placing the organism under
the Class you have stated?
(4)
2. Identify the morphometry indices indicated as A, B, C, D, E, F, G, H and | in the fish
diagram shown below.
(9)
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. Identify the types of caudal fins shown in the diagram below?
(4)
. Which of the following is a true description of the intertidal zones?
(1)
a. The zone between highest high tide level and lowest high tide level
b. The zone between lowest high tide level and highest low tide level
c. The zone between lowest high tide level and lowest low tide level
d. The zone between highest high tide level and lowest low tide level
e. The zone between the highest level of the splash zone and the lowest high tide level.
. Which of the following products is obtained from Laminaria?
(1)
a. Spirulina
b. Carrageenan
c. Agar - agar
d. Idodine
e. Chlorellin
. Agreat white shark will be part of which of the following marine lifestyle?
(1)
a. Plankton
b. Epifauna
c. Benthos
d. Nekton
e. Infauna
. The filamentous locomotory structures of the dinoflagellates are referred to as?
(1)
a. Cilia
b. Antennae
c. Pleopods
d. Flagella
e. Pseudopodia
. The zone of the ocean where there is enough light for primary productivity is the?
(1)
a. Aphotic zone
b. Benthic zone
c. Euphotic zone
d. Hadal zone
e. Abyssal zone
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9. Under which group of zooplankton will the fish larva be classified?
(1)
a. Holoplankton
b. Meroplankton
c. Microplankton
d. Nanoplankton
e. Phytoplankton
10. What is the estimated percentage of coral reefs on the sea surface?
(1)
a. More than 20%
b. Between 1 and 10%
c. Between 10 and 20%
d. Less than 1%
e. Above 50%
11. Which of the following vertical profile of the marine benthic environment will the
sponges be the most dominate species in the ecological communities?
(1)
a.0-100m
b. 100 - 500 m
c. 500 - 1000 m
d. 1000 — 2000 m
e. 2000 — 7000 m
SECTION B (SHORT EXPLANATION QUESTIONS): ANSWER ALL QUESTIONS
[30]
12. a). Explain the following terms as applied in Marine Biology.
(6)
i. Conformers
ii. Euryhaline
iii. Anadromous
b). Explain the impact of zooplankton grazing on the biological productivity of the
marine ecosystem.
(4)
13. a). Explain the term ‘upwelling’ and its effects on the productivity of the marine
ecosystem.
(6)
b). Explain how eutrophication lead to reduction in biological productivity within the
marine ecosystem.
(4)
14. a). What does the following abbreviations refer to in fisheries management:
(4)
i. CPUE
ii. TAE
iii. TAC
iv. MPAs
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b). Explain the two main goals of ecosystem-based fisheries management.
(4)
c). Give the mathematical expression of the MSY model.
(2)
SECTION C (DISCUSSION QUESTIONS) ANSWER ANY THREE QUESTIONS
[45]
15. With suitable examples, discuss the various environmental challenges faced by intertidal
communities highlighting the survival strategies employed by the organisms in coping
with these challenges.
(15)
16. With reference to water column stability, light and nutrients discuss the seasonal
pattern of plankton abundance in the marine environment.
(15)
17. a). With the aid of suitable illustrative diagrams, discuss the ‘counter-current heat
exchange’ mechanism in marine tunas.
(9)
b). With reference to survival strategies, discuss how estuarine animals have adapted to
coping with salinity variations within the estuarine environment.
(6)
18. Discuss the major impacts of global warming and acidification on the ocean
physicochemical parameters and explain how these impacts will affect the biology,
habitat and behaviour of major fish stocks.
(15)