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2 marksSexual Reproduction in Humans

CAPE Biology Unit 1 · 2017 · Paper 2 · Question 3(b)(iii)

Figure 5 is a drawing of a section through a human placenta in situ, with structures I, II, and III labeled.

Outline TWO ways in which the placenta acts as a protective barrier for the developing foetus.

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Other parts of this question

  1. 3(a)(i)On the grid provided in Figure 4, plot line graphs for the data given in Table 3.[4 marks]
  2. 3(a)(ii)Briefly describe the overall trend for the effect of different sucrose concentrations, in both culture media, on the germination rate of the palm pollen.[2 marks]
  3. 3(a)(iii)Based on the results shown in Table 3, what can be deduced about the effect of the type of culture medium on the maximum rate of pollen germination?[2 marks]
  4. 3(b)(i)Identify and describe the main function of EACH of the structures labelled I, II and III.[3 marks]
  5. 3(b)(ii)Comment on TWO roles of the structure labelled Y in the development of the foetus.[2 marks]

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