Which of the following statements is NOT TRUE about fishes?

Correct option is A

The correct answer is (a) Fishes have double circulation.
· Fishes do not have double circulation.
· Instead, they have a single circulatory system where blood passes through the heart only once in each complete cycle.
Information Booster:
· Single Circulation: Fishes exhibit single circulation, meaning blood flows in a single loop (heart → gills → body → heart).
· Double Circulation (seen in mammals and birds): In double circulation, blood passes through the heart twice in each cycle, aiding in more efficient oxygen distribution.
· Two-Chambered Heart: Fish hearts, with two chambers, are simpler compared to the four-chambered hearts in mammals.
Explanation of Other Options:
· Fishes have only two chambers to their hearts: This is correct. Fish hearts consist of one atrium and one ventricle.
· Blood is pumped through the fishes' gills and gets oxygenated: Correct. In fish, blood is oxygenated as it passes through the gills.
· Blood goes only once in one cycle through the heart of a fish: This is correct, as fish have single circulation, where blood passes through the heart once per cycle .
Additional Knowledge:
· Oxygenation Process: Fishes use their gills for gas exchange, allowing oxygen to diffuse into the blood as it flows over the gill filaments.
· Cold-blooded Nature: Fishes are ectothermic (cold-blooded) and rely on external temperatures to regulate body heat.
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