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6 marksTransport Systems

CSEC Biology · January 2011 · Paper 2 · Question 5(b)(ii)

The spread of communicable diseases that affect humans declined significantly when artificial immunization through the use of vaccines was introduced.

Suggest why vaccines may NOT always have the desired effect in treating persons infected with disease.

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Other parts of this question

  1. 5(a)Identify ONE communicable disease and the pathogen that causes the disease.[2 marks]
  2. 5(b)(i)Describe how a vaccine works in building immunity.[6 marks]
  3. 5(c)(i)Suggest why this method of control is sometimes used.[7 marks]
  4. 5(c)(ii)Give TWO economic and TWO social consequences of widespread disease among crop plants.[7 marks]

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