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6 marksTransport Systems

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

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

Describe how a vaccine works in building immunity.

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