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4 marksEcology, Niches, and Interactions

CAPE Environmental Science Unit 1 · 2012 · Paper 2 · Question 1(a)

Figure 1 illustrates the population size of the aquatic duckweed (Lemna minor) growing in canals adjacent to farms discharging effluent containing agrochemicals.

Using an example other than agrochemicals, explain what is meant by the term 'limiting factor'.

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Other parts of this question

  1. 1(b)Using the information provided in Figure 1, describe the trend in population size of the duckweed.[4 marks]
  2. 1(c)(i)It was determined that there was a high concentration of phosphate and nitrate in the effluent. Using the information in Figure 1, explain why the effluent…[8 marks]
  3. 1(c)(ii)Explain how the variation in the duckweed population may impact on the population of other aquatic species in the same ecosystem.[4 marks]

More practice: the rest of this paper · more Ecology, Niches, and Interactions questions · all CAPE Environmental Science Unit 1 past papers