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4 marksThe Kidney, Excretion and Osmoregulation

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

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.

Identify the cross sections labelled I and II and for EACH, state ONE observable feature which justifies the given identification.

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Other parts of this question

  1. 2(a)(ii)Comment on the main function of the region labelled III.[1 mark]
  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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