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2 marksTransport Systems

CSEC Biology · January 2013 · Paper 2 · Question 1(a)(iii)

An athlete, normally living and training at sea level with a red blood cell count of 4.2 million per unit of blood, began training at 2,500 m above sea level for an event. His red blood cell count was measured monthly for six months. Table 1 shows these counts.

Taking into account the concentration of oxygen at higher altitudes, give an explanation for the change in the red blood cell count at higher altitudes.

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Other parts of this question

  1. 1(a)(i)On the grid provided below, draw a graph to represent the data in Table 1.[5 marks]
  2. 1(a)(ii)Describe the shape of the graph between Months 1 and 3 and between Months 4 and 6.[2 marks]
  3. 1(a)(iv)Suggest a suitable hypothesis for the results shown in Table 1.[2 marks]
  4. 1(a)(v)What would be a suitable control in an experiment being conducted to test the hypothesis suggested in (iv) above?[2 marks]
  5. 1(b)(i)How do the red blood cells of Katz differ from normal red blood cells?[2 marks]
  6. 1(b)(ii)Explain why sickle-cell anaemia makes Katz feel tired easily.[2 marks]
  7. 1(c)(i)Suggest ONE condition under which the number of white blood cells in the human body will be increased.[1 mark]
  8. 1(c)(ii)State the function of TWO different types of white blood cells.[2 marks]
  9. 1(c)(iii)Suggest why red blood cells have a shorter life span than that of white blood cells.[1 mark]
  10. 1(d)(i)Describe TWO ways by which plants protect themselves from excess water loss.[2 marks]
  11. 1(d)(ii)State the name used to describe the mode of nutrition in plants.[1 mark]
  12. 1(d)(iii)Name the organelle found in the cells of green plants that is responsible for the type of nutrition stated in (ii) above.[1 mark]

More practice: the rest of this paper · more Transport Systems questions · all CSEC Biology past papers