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MAB702S - MARINE BIOLOGY 3B - 1ST OPP - NOV 2022 |
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r
nAmlBIA UnlVERSITY
OF SCIEnCE AnDTECHnOLOGY
FACULTYOF HEALTH,NATURAL RESOURCESAND APPLIEDSCIENCES
DEPARTMENT OF NATURALAND APPLIEDSCIENCES
QUALIFICATION:BACHELOROF SCIENCE
QUALIFICATIONCODE:07BOSC
COURSECODE:MAB702S
SESSION:NOVEMBER2022
DURATION: 3 HOURS
LEVEL:7
COURSENAME: MARINE BIOLOGY3B
PAPER:THEORY
MARKS: 100
EXAMINER (S):
MODERATOR:
FIRSTOPPORTUNITYEXAMINATION QUESTIONPAPER
Dr. EdosaOmoregie
Dr. Johannes litembu
INSTRUCTIONS
1. Answer all questions in Sections A, Band C
2. Write clearly and neatly.
3. Number your answers clearly.
4. Draw diagrams wherever necessary
Material/s allowed
Scientific Calculator
THIS QUESTION PAPERCONSISTSOF 5 PAGES
(Including this front page)
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ANSWER ALL QUESTIONS
Section A:
[20]
1. a). The diagram below is an illustration of a common intertidal one organism encountered
during the class practical field survey.
i. State the Genus, Class and Phylum the organism belongs to?
(2)
ii. Explain the main reason for placing the organism under its Class?
(1)
b). The diagrams below are ventral and dorsal views of a marine invertebrate
encountered during the class field practical exercise at an intertidal zone.
C
0
Name the parts labelled as A, B, C and D.
(2)
What is the common name of this invertebrate?
(1)
What Phylum does this invertebrate belong to?
(1)
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c). Name the parts labelled in the diagram below. Briefly explain the functions of the
part labelled as D, E and F.
{3)
2. The sea anemones belong to which of the following classes of marine animals?
(1)
a. Hydrozoa
b. Scyphozoa
c. Anthozoa
d. Calcarea
e. Hexactinellida
3. Which of the following pigments is predominate in the seaweed Phylum, Phaeophyta? (1)
a. Chlorophyl
b. Phycobilin
c. Fucoxanthin
d. Carotenes
e. Flavoxanthin
4. Which of the following phyla do the barnacles belong to?
{1)
a. Annelida
b. Echinodermata
c. Mollusca
d. Arthropoda
e. Cnidaria
5. Which of these groups of marine molluscs belong to the Class Bivalvia?
(1)
a. Octopuses, Squids, Nautilus
·b. Clams, Mussels, Oysters
c. Snails, Abalone
d. Slugs, Periwinkles
6. Which of the following options is not a factor determining benthos survival in rocky
intertidal zones?
{1)
a. Susceptibility to predation
b. Wave action
c. Boring mechanism
d. Light and temperature
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e. Salinity
7. Which of the following statements is true regarding marine productivity resulting from
upwelling?
(1)
a. Water that rises to the surface from the bottom of the sea because of upwelling is
typically colder and is rich in microalgae.
b. Water that rises to the surface from the bottom of the sea because of upwelling is
typically colder and is rich in nutrients.
c. Water that rises to the surface from the bottom of the sea because of upwelling is
typically warmer and is poor in microalgae.
d. Water that rises to the surface from the bottom of the sea because of upwelling is
typically colder and is poor in nutrients.
e. Water that rises to the surface from the bottom of the sea because of upwelling is
typically warmer and is rich in nutrients.
8. The solubility of oxygen in seawater is affected non-linearly by temperature. Is this
statement true or false?
(1)
a. True
b. False
9. Under which of the following percentages of dissolved oxygen saturation level in seawater
will oxygen diffuse out of the seawater to the atmosphere?
(1)
a. 110%
b. 48%
C. 100%
d. 25%
10. Which of the following options best describe morphologically structure of the horse
mackerel caudal fin?
(1)
a. Heterocercal
b. Truncated
c. Lunate
d. Rounded
e. Forked
11. Crustaceans are distinguished from other arthropods by their possession of a pair of
________
(two-parted limbs).
(1)
Section B:
[20]
12. a). Briefly discuss the main factors affecting feeding behaviour in marine copepods. (4)
b). Explain the following terms as applied in Marine Biology.
(6)
i. LDso
ii. Euryhaline
iii. Anadromous
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c). Discuss the unique characteristics of the various groups of benthos based on size, type
and location, naming at least one marine benthic organism for each group.
{6)
d). With suitable named example for each group, differentiate benthic scavengers from
their detritivorous counterparts.
(4)
Section C:
[60]
13. a). With graphical illustrations, explain the major differences in seasonal variation
patterns in plankton abundance in Artie, Temperate and Tropical waters.
{14)
b). Briefly discuss the various hypothesis for the diurnal vertical migration of
zooplankton in the marine environment.
{6)
14. a). With reference to survival strategies, discuss how estuarine animals have adapted to
coping with salinity variations within the estuarine environment.
(5)
b). With suitable examples, discuss the various environmental challenges faced by
intertidal organisms. For each of the challenges discussed, briefly explain the
strategies employed by these organisms for their survival.
{15)
15. a). With suitable graphical illustration, briefly explain the concept of MSY in fisheries
management.
(6)
b). Explain the major impacts of global warming on the ocean physicochemical
parameters and discuss how these impacts will affect the biology, habitat and
behaviour of major fish stock.
{14)
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