Page 1 of 2
ARHOLIADAU EXAMINATIONS
SEMESTER 2 EXAMINATIONS 2011
IBERS (BIOLOGICAL SCIENCES)
BS00510 BIOLOGICAL ORGANISATION AND FUNCTION
TIME ALLOWED: TWO HOURS
ANSWER ALL QUESTIONS IN ONE ANSWER BOOK
Annotated drawings or sketches can be used as part of any answer: total 100 marks.
1. With the aid of simple labelled diagrams describe the basic types of circulatory system,
naming an example of an organism for each. What are the advantages and
disadvantages of these different systems. (9 marks)
2. A human sperm cell is perfectly adapted to its function. With the aid of an annotated
diagram describe its structure and adaptations. (8 marks)
3. Draw a fully labelled graph to show the ‘dissociation curve’, for human haemoglobin
and describe where and why oxygen is loaded and unloaded. (6 marks)
4. How is the blood plasma and haemoglobin involved in the transport of carbon dioxide
in the human body? (7 marks)
5. Describe the key stages and processes in spermatogenesis. (8 marks)
6. Explain how negative feedback regulates blood sugar levels. A fully annotated diagram
MAY be sufficient. (8 marks)
7. Draw simple, clear, line diagrams of a transverse section of a plant stem, a plant root
and a typical leaf to show the key tissues. Fully label the diagrams. (9 marks)
8. How is the cardiac cycle initiated and controlled via the sino-atrial node. (8 marks)
9. Describe the tissues involved and the possible mechanism for the transport of organic
solutes in vascular plants. (7 marks)
10. What is the effect of light, humidity and wind speed on the rate of transpiration? Give a
brief explanation of the reasons. (6 marks)
