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1 markThe Kidney, Excretion and Osmoregulation

CAPE Biology Unit 2 · 2017 · Paper 2 · Question 2(a)(ii)

Figure 3 is a stained section through the medulla of the kidney showing cross sections through some functional regions of the nephron and associated ducts.

Comment on the main function of the region labelled III.

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Other parts of this question

  1. 2(a)(i)Identify the cross sections labelled I and II and for EACH, state ONE observable feature which justifies the given identification.[4 marks]
  2. 2(a)(iii)In BOX II, make a detailed drawing of the cross section labelled II. NOTE: No title or magnification is required.[3 marks]
  3. 2(b)(i)With reference to the structure of stomata, explain the nature of the relationship between stomata and transpiration.[3 marks]
  4. 2(b)(ii)Using the data given in Figure 4, compare the general trend in transpiration rates of the plant in still air and under windy conditions.[3 marks]
  5. 2(b)(iii)Suggest an explanation for the results obtained for the experiment done under windy conditions.[1 mark]

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