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WAEC Biology 2006 Question 29

Question 29

Food Substances and Enzymes

Study the following list of deficiency symptoms in animals:
I. Loss of appetite and weight; II. Delayed healing of wounds; III. Rickets; IV. Sterility in animals; V. Failure of blood to clot; VI. Night blindness
Which of the following deficiencies is caused by lack of vitamin A

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

Answer: D (VI)

Explanation

Vitamin A is needed to make the light-sensitive pigment in the rods, so lack of it causes night blindness.