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JAMB Biology 1982 Question 27

Question 27

Respiration

When an operculate fish breathes it takes in water through the

  1. A.mouth and passes it out through the same way
  2. B.mouth and passes it out through the operculum
  3. C.operculum and passes it out through the mouth
  4. D.operculum and passes it out through the nostrils
  5. E.nostrils and passes it out through the operculum.
Show the answer and explanation

Answer: B (mouth and passes it out through the operculum)

Explanation

Water enters through the mouth, flows over the gills and leaves under the operculum.