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3 marksEcology, Niches, and Interactions

CAPE Environmental Science Unit 1 · 2011 · Paper 2 · Question 1(a)(iii)

Figure 1 illustrates how the populations of two symbiotic species change over a 12-month period.

Evaluate the statement that the presence of Species 2 acts as a limiting factor for Species 1, providing one reason to justify your response.

This question uses a figure or table from the paper — you'll see it when you practise.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 1(a)(i)State the type of symbiotic relationship shown in Figure 1.[1 mark]
  2. 1(a)(ii)Explain how the symbiotic relationship identified in (a)(i) could result in a population curve resembling Figure 1.[4 marks]
  3. 1(a)(iv)Determine after how many months the difference in population size between Species 1 and Species 2 reaches its maximum, showing how the answer was determined.[3 marks]
  4. 1(a)(v)Identify the minimum population size of Species 1 shown on the graph.[1 mark]
  5. 1(b)(i)Reproduce the outline of the ecological pyramid and label each trophic level with the correct organism chosen from: Cricket, Lizard, Grass, Mongoose.[4 marks]
  6. 1(b)(ii)Using the completed ecological pyramid from (b)(i), explain how energy flows through an ecosystem.[4 marks]

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