2023
Biology
POST UTME
The sequence of the one-way gaseous exchange mechanism in a fish is
A.
mouth → operculum → gills
B.
mouth →gills →operculum
C.
gills → operculum →mouth
D.
operculum -gills →mouth
Correct Answer: mouth →gills →operculum
Explanation
The fish takes in water through the mouth. It then raises its head so that the water rushes into the gill chamber. When the oxygen in the water has been harnessed, it lowers the floor of the mouth and then opens the operculum for the water to come out.
The fish takes in water through the mouth. It then raises its head so that the water rushes into the gill chamber. When the oxygen in the water has been harnessed, it lowers the floor of the mouth and then opens the operculum for the water to come out.
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