The sequence of the one-way gaseous exchange mechanism in...
The sequence of the one-way gaseous exchange mechanism in a fish is
mouth → operculum → gills
mouth → gills → operculum
operculum → gills → mouth
gills → operculum → mouth
Correct answer is B
Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. In some fish, capillary blood flows in the opposite direction to the water, causing counter-current exchange. The gills push the oxygen-poor water out through openings in the sides (opercula) of the pharynx.
One of the following is most suitable for study of mutations ...
Which of the following infections would not respond to antibiotic treatment? ...
Filtrates in the Bowman’s capsule contains vitamins because ...
In the diagram, the type of adaptation shown in the larva is ...
These groups of bacteria are harmless EXCEPT ...
Tooth decay is usually caused by___________ ...
A solution which contains all the required elements in their correct proportions is known as a ...
Which of the following relationship involves only one organism? ...