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1 markRelationships Among Organisms

CSEC Biology · January 2019 · Paper 2 · Question 2(b)(iii)

Figure 1 shows the growth of two spider mite populations: one plant-eating, one carnivorous.

Assuming that the population of the predator drops to zero, extend the curve of the prey population on the graph. (Assume that no other changes have occurred in this community.)

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Other parts of this question

  1. 2(a)(i)Name TWO biotic factors and ONE abiotic factor that may account for the extinction of a species.[2 marks]
  2. 2(a)(ii)State TWO activities of humans which may have a negative impact on species diversity and TWO measures that may be taken to reduce the impact of these…[4 marks]
  3. 2(b)(i)Label on the graph the curve which represents the predator, using the letter A.[1 mark]
  4. 2(b)(ii)Use the number of organisms and the shape of the curves to state TWO reasons for your answer in (b) (i).[2 marks]
  5. 2(b)(iv)Assuming that the population of the prey drops to zero, extend the curve of the predator population on the graph. (Assume that no other changes have occurred…[1 mark]
  6. 2(c)Suggest THREE possible reasons for the lower yield obtained in the plot with the larger number of seeds.[3 marks]

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