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ARHOLIADAU EXAMINATIONS
SEMESTER 2 EXAMINATIONS 2010
IBERS (BIOLOGICAL SCIENCES)
BS00510 BIOLOGICAL ORGANISATION AND FUNCTION
TIME ALLOWED: TWO HOURS
ANSWER ALL QUESTIONS
ANNOTATED DRAWINGS OR SKETCHES CAN BE USED AS PART OF ANY ANSWER
1 With the aid of simple, labelled diagrams, describe the different types of
circulatory systems found in animals. What are the advantages of the type of
circulatory system found in man. (10 marks)
2 Describe the circulation of blood through the human heart, referring to the
names of the chambers, blood vessels and valves. (10 marks)
3 How is the cardiac cycle controlled in man. (10 marks)
4 Draw a graph to show the dissociation curve, for human haemoglobin. Draw
two further dissociation curves on the same diagram to show: (i) the position of
foetal haemoglobin (ii) the Bohr effect. Fully label the graph. (5 marks)
5 How is carbon dioxide carried by the blood? (5 marks)
6 Explain how negative feedback regulates blood sugar levels. (A fully annotated
diagram would be sufficient) (10 marks)
7 Describe what is meant by ‘the transpiration pull and the Cohesion-tension
theory’. (5 marks)
8 What is the effect of light, humidity and wind speed on the rate of transpiration?
(5 marks)
