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1 markVectors, Microorganism Control and Immunity

CSEC Human and Social Biology · January 2012 · Paper 2 · Question 1(e)(i)

An experiment where a swab from teeth is cultured on an agar plate.

State the objective of the experiment shown in Figure 2.

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Other parts of this question

  1. 1(a)Fill in the blanks using terms from the list (evaporates, condenses, evaporation, condensation) to describe water vapour formation and cooling.[2 marks]
  2. 1(b)State TWO agricultural practices that could lead to water contamination.[2 marks]
  3. 1(c)Identify TWO diseases transmitted through contaminated water.[2 marks]
  4. 1(d)(i)Using the provided grid in Figure 1, plot a histogram displaying the data presented in Table 1.[3 marks]
  5. 1(d)(ii)Based on the information in Table 1, explain the relationship between levels of pollutants and the occurrence of cancer.[2 marks]
  6. 1(d)(iii)Provide ONE explanation for the significant rise in cancer cases between 2000 and 2009 relative to the modest 2% rise in pollutants.[2 marks]
  7. 1(e)(ii)Identify ONE hazard associated with performing this microbiological culturing procedure.[1 mark]

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