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4 marksImpact of Metals on Living Systems and the Environment

CSEC Chemistry · May/June 2009 · Paper 2 · Question 7(c)

Farmers use chemicals to control pests. Biological control, e.g., parasitic wasps for pink mealy bug, is another method.

Suggest ONE advantage and ONE disadvantage EACH of biological and chemical control of pests.

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Other parts of this question

  1. 7(a)(i)What is meant by the term 'humus' as it relates to soil?[4 marks]
  2. 7(a)(ii)State THREE reasons why humus is an important component of soil.[4 marks]
  3. 7(b)For which ions is the student MOST likely testing?[1 mark]
  4. 7(d)(i)What is meant by the term 'hydroponics'?[2 marks]
  5. 7(d)(ii)Advise Mrs. Wills on TWO advantages and TWO limitations of setting up such a farm.[4 marks]

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