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7 marksRelationships Among Organisms

CSEC Biology · May/June 2008 · Paper 2 · Question 4(b)(i)

Biological control usually involves introducing new species to an ecosystem to reduce or control pest populations.

Identify ONE relationship that is important in biological control and explain how this relationship functions in biological control.

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Other parts of this question

  1. 4(a)(i)Explain why food chains usually begin with a plant species.[8 marks]
  2. 4(a)(ii)Using an appropriate diagram, show how a plant or animal may belong to more than one food chain.[8 marks]
  3. 4(a)(iii)Explain why the number of organisms decreases at the successive trophic levels.[8 marks]
  4. 4(b)(ii)Suggest TWO reasons why biological control is a preferred method of reducing pest populations compared to the use of pesticides.[7 marks]

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