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WAEC Biology 2004 Question 22

Question 22

Sense Organs

Which of the following occurs when a person looks at a distant, dim object and then looks at a much closer, bright object? In each eye, the pupil becomes

  1. A.larger, while the lens becomes thicker
  2. B.larger, while the lens becomes thinner
  3. C.smaller, while the lens becomes thicker
  4. D.smaller, while the lens becomes thinner
Show the answer and explanation

Answer: C (smaller, while the lens becomes thicker)

Explanation

In bright light the iris narrows the pupil. For a near object the ciliary muscles contract, the suspensory ligaments slacken and the lens becomes thicker.