Question

How many chambers are there in a fish heart?
A. Two
B. Three
C. Four
D. One

Answer 1

Hint: Fishes lie under super class pisces of phylum chordata showing single circulation.

Complete answer:
1. Fishes lie under super class pisces of phylum chordata (animals bearing fins).
2. Fishes may be either chondrichthyes (entirely marine fishes with cartilaginous exoskeleton) or osteichthyes (both marine and freshwater fishes with bony endoskeleton.)
3. As fishes are aquatic animals they have to take oxygen from water for that fishes have a specialised system.
4. Fishes have a two chambered heart with a single atrium and a single ventricle.
5. Fishes show a single type of circulation.
6. Atrium collects blood that has returned from the body and ventricle pumps blood to the gills where gas exchange occurs and the blood is reoxygenated which is then supplied to the whole body this is known as gill circulation.
7. These are cold blooded animals know as poikilotherms

So the correct answer is option (A)Two.

Additional information : Gill circulation is majorly seen in fishes.

Note: Fishes have one atrium and one ventricle.