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3 marksWater and Land Pollution

CAPE Environmental Science Unit 2 · 2008 · Paper 2 · Question 9(a)

Figure 6 shows the variation in BOD and DO concentration with distance downstream from a reference point in a river.

What information is provided by the BOD of a water sample?

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Other parts of this question

  1. 9(b)Outline the laboratory process for determining BOD.[5 marks]
  2. 9(c)Identify the type of water pollution source impacting the river and justify your response.[3 marks]
  3. 9(d)Account for the changes in DO concentration along the river.[5 marks]
  4. 9(e)At what distance from the reference point is it LIKELY that dead fish will be found floating in the river? Justify your answer.[4 marks]

More practice: the rest of this paper · more Water and Land Pollution questions · all CAPE Environmental Science Unit 2 past papers