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BIOLOGY

JAMB 2016 - Question 33

Biology 2016 JAMB Past Questions - Question 33: The sequence of the one-way gaseous exchange mechanism in a fish is

use the diagram below to answer the questions 32 and 33

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

A: gills --- ------ operculum -------mouth

B: mouth ---------gills -------------operculum

C: operculum -------------mouth ------------ gills

D: mouth ---------operculum --------------gills.

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Correct Answer

Explanation

During external respiration, fish opens its mouth water flows in. the water is directed to the sides of the buccal cavity where it bathes the gills. Oxygen In the water diffuses into the blood in the caplanes lining the gills while carbon IV oxide diffuses out into the water. water containing the carbon IV oxide leaves the body of th® fish through the operculum or gill cover and the sequence is repeated.