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2 marksRelationships Among Organisms

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

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

Use the number of organisms and the shape of the curves to state TWO reasons for your answer in (b) (i).

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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)(iii)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…[1 mark]
  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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