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1 markEcology, Niches, and Interactions

CAPE Environmental Science Unit 1 · 2004 · Paper 1 · Question 3(a)(iii)

Figure 2 displays the survival curve of a plant species as population density across varying soil pH values.

From Figure 2, identify the pH range of the soil for the optimal range.

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Other parts of this question

  1. 3(a)(i)From Figure 2, identify the pH range of the soil for the zone of physiological stress.[1 mark]
  2. 3(a)(ii)From Figure 2, identify the pH range of the soil for the zone of intolerance.[1 mark]
  3. 3(b)State two reasons why some factors affecting species survival are termed 'limiting factors'.[2 marks]
  4. 3(c)State one effect on a population when an abiotic factor shifts beyond its limit of tolerance.[1 mark]

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