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JAMB Biology 2011 Question 26

Question 26

Respiration

The sequence of the one-way gaseous exchange mechanism in a fish is

  1. A.mouth → operculum → gills
  2. B.mouth → gills → operculum
  3. C.operculum → gills → mouth
  4. D.gills → operculum → mouth.
Show the answer and explanation

Answer: B (mouth → gills → operculum)

Explanation

The fish takes water in through its mouth, passes it over the gills where oxygen is absorbed, and lets it out under the operculum.