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6 marksHuman Impact on the Environment

CSEC Biology · May/June 2017 · Paper 2 · Question 6(b)(i)

Some environmentalists encourage the practice of introducing predators to an ecosystem to control a population of pests rather than the use of agricultural chemicals.

Outline THREE advantages and THREE disadvantages of this method of biological control compared to the use of chemicals.

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Other parts of this question

  1. 6(a)Using a suitable example of EACH, distinguish between a predator-prey relationship and parasitism.[6 marks]
  2. 6(b)(ii)Explain how biological control may contribute to biological evolution through natural selection in an ecosystem.[3 marks]

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