 |
MAB701S - MARINE BIOLOGY 3A - 1st Opp - JUNE 2022 |
|
|
1 Page 1 |
▲back to top |
p
NAMIBIA UNIVERSITY
OF SCIENCE AND TECHNOLOGY
FACULTY OF HEALTH, APPLIED SCIENCES AND NATURAL RESOURCES
DEPARTMENT OF NATURAL AND APPLIED SCIENCES
QUALIFICATION: BACHELOR OF SCIENCE
QUALIFICATION CODE: 07BOSC
COURSE CODE: MAB701S
SESSION: JUNE 2022
DURATION: 3 HOURS
LEVEL: 7
COURSE NAME: MARINE BIOLOGY 3A
PAPER: THEORY
MARKS: 100
EXAMINER (S):
MODERATOR:
FIRST OPPORTUNITY EXAMINATION QUESTION PAPER
Dr. Edosa Omoregie
Dr. Johannes litembu
INSTRUCTIONS
1. Answer all questions in Sections A and Section B.
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)
|
|
2 Page 2 |
▲back to top |
SECTION A
Answer all questions
Total marks [55]
1. List the two ions that occur in the highest concentrations in seawater
(2)
2. With reference to the life cycle and suitable examples, differentiate holoplankton and
meroplankton.
(4)
How many ATP molecules are utilized and produced during the process of glycolysis of
one molecule of glucose?
(2)
With the aid of an appropriate schematic diagram and reference to the photic and
aphotic zone, briefly explain the concept of compensation depth in the pelagic zone of
the marine environment.
(5)
Why are certain angiosperms referred to as halophytes?
(2)
Name any four macronutrients and two micronutrients inthe marine ecosystem? (3)
What is the most common form of silicon in seawater?
(2)
What are Phycocolloids? Name any two Phycocolloids and their economic importance (4)
Using the Henrys’ gas law equation, calculate the molar concentration of nitrogen gas
in seawater under 1.5 atmospheric pressure? Given: Ky of nitrogen gas in water =
1639.34 mm Hg /(mol/L).
(4)
10. Name the major group of the microbial community responsible for aerobic ammonium
oxidation in the marine ecosystem.
(2)
11. What is the scientific name of the largest bacterium discovered off the Namibia marine
waters?
(2)
12. In a tabular form, outline the main differences between marine Coccolithophores and
Silicoflagellates?
(4)
13. What is the function of the protonephridia in marine flatworms?
(2)
14. What class of the Chrysophyta do the diatoms belong to?
(2)
15. Name the four classes of marine Platyhelminthes.
(2)
16. Highlight any two characteristics of marine cephalopods.
(2)
|
|
3 Page 3 |
▲back to top |
17. Inatabular form, outline the main structural differences between marine diatoms and
marine dinoflagellates.
(4)
18. What is the main function of the chromatophores in marine fish?
(2)
19. Why are marine sponges referred to as filter feeders?
(2)
20. Briefly describe the main features of the Scyphozoans.
(3)
SECTION B
Answer all questions
Total marks [45]
21. With reference to oxidation state, type of microorganisms involved and chemical
equations, describe the processes of nitrogen fixation and nitrification in the marine
environment.
(15)
22. Using suitable illustrations, discuss the different types of reproduction in a name marine
macroalgae.
(15)
23. Using suitable illustrations, discuss the counter-current gas exchange mechanism in
marine fish.
(15)