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4 marksEcology, Niches, and Interactions

CAPE Environmental Science Unit 1 · 2009 · Paper 2 · Question 1(a)

An aquatic algal species in an ecosystem experiences variation in nutrient concentration, affecting its population size.

Define what is meant by 'limiting factor' and state THREE ways in which limiting factors operate.

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Other parts of this question

  1. 1(b)With reference to Figure 1, describe how the population size of the algal species changes with the variation in nutrient concentration.[4 marks]
  2. 1(c)(i)For the relationship between population size of algae and nutrient concentration in Figure 1, explain using EIGHT points how nutrient variation impacts the…[8 marks]
  3. 1(c)(ii)Explain using FOUR points how the variation in the algae population impacts the population of other species in the ecosystem.[4 marks]

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