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JAMB Biology 1985 Question 39

Question 39

Sense Organs

An old man is likely to be long-sighted because age affects the

  1. A.optic nerves
  2. B.retina
  3. C.ciliary muscles
  4. D.cornea
  5. E.aqueous humour.
Show the answer and explanation

Answer: C (ciliary muscles)

Explanation

With age the ciliary muscles weaken and the lens loses its elasticity, so the eye cannot thicken the lens to focus on near objects (long-sightedness).