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8 marksThe Kidney, Excretion and Osmoregulation

CAPE Biology Unit 2 · May/June 2019 · Paper 2 · Question 2(c)

The control of the water content (water potential) of the body is called osmoregulation.

In the space below, construct an annotated flow chart to illustrate the mechanism by which the body responds to reduced blood water content (low water potential). Your flow chart should identify the effector, receptor, regulator and response.

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Other parts of this question

  1. 2(a)(i)On the grid provided on page 11, plot a line graph of the data provided in Table 1 with time on the x-axis.[6 marks]
  2. 2(a)(ii)State TWO key observations that can be made based on the results of this study.[2 marks]
  3. 2(a)(iii)Explain the mechanisms by which glucagon and insulin function to maintain a normal concentration of glucose in the blood.[6 marks]
  4. 2(a)(iv)Comment on the clinical significance of the presence of glucose in the urine.[2 marks]
  5. 2(b)With reference to the properties of ethylene, analyse its actions to bring about desirable changes in fruits during commercial ripening.[6 marks]

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