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3 marksSexual Reproduction in Humans

CAPE Biology Unit 1 · 2018 · Paper 2 · Question 3(a)(iii)

Dental amalgam fillings are composed of approximately 50% metallic mercury. Mercury is a toxin and has been linked to neurodevelopmental disorders in babies. Table 1 shows the relationship between mercury fillings and the concentration of mercury in the blood.

Explain whether the movement of mercury from mother to foetus is an active or a passive process.

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Other parts of this question

  1. 3(a)(i)On the grid provided below, draw a bar chart to compare the concentration of mercury in maternal and foetal blood with the number of maternal amalgam fillings.[3 marks]
  2. 3(a)(ii)State TWO conclusions based on the comparisons shown on the graph.[2 marks]
  3. 3(b)Write the correct labels for A, B, C and D.[2 marks]
  4. 3(c)(i)Describe the events following pollination which lead to double fertilization.[3 marks]
  5. 3(c)(ii)State the significance of double fertilization to the human diet.[2 marks]

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