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6 marksPhotosynthesis and Energy Flow

CSEC Human and Social Biology · January 2010 · Paper 2 · Question 14(c)(ii)

Figure 9 shows part of a food chain: Citrus plants -> citrus bugs -> birds. Farmers use insecticides to control the citrus bugs.

Farmers decide to use biological control using a wasp to kill citrus bugs. Suggest ONE advantage of this biological control method and TWO possible effects on the food chain.

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Other parts of this question

  1. 14(a)(i)Define EACH of the following terms: Herbivore, Carnivore, Omnivore.[3 marks]
  2. 14(a)(ii)What is meant by the term 'primary producer'?[2 marks]
  3. 14(b)Construct a food chain consisting of the following organisms: mountain chicken, cricket, humans, grass, and lizard.[3 marks]
  4. 14(c)(i)Discuss the adverse effects of insecticides on the environment, providing THREE distinct points.[6 marks]

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