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4 marksEcology, Niches, and Interactions

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

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

Explain how the symbiotic relationship identified in (a)(i) could result in a population curve resembling Figure 1.

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.

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Other parts of this question

  1. 1(a)(i)State the type of symbiotic relationship shown in Figure 1.[1 mark]
  2. 1(a)(iii)Evaluate the statement that the presence of Species 2 acts as a limiting factor for Species 1, providing one reason to justify your response.[3 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