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WAEC Biology 2012 Question 11

Question 11

Microorganisms and Health

The table shows the blood composition of four individuals.
Individual I: plasma normal, red blood cells normal, white blood cells high, platelets normal.
Individual II: plasma normal, red blood cells normal, white blood cells normal, platelets normal.
Individual III: plasma normal, red blood cells normal, white blood cells low, platelets normal.
Individual IV: plasma normal, red blood cells normal, white blood cells normal, platelets low.
Which of the individuals is likely to have HIV?

  1. A.I
  2. B.II
  3. C.III
  4. D.IV
Show the answer and explanation

Answer: C (III)

Explanation

HIV destroys white blood cells (lymphocytes), so an infected person has a low white cell count, like individual III.