Question

Which of the following are the distinguishing feature between betta & Carcharodon
a) Chambers in heart
b) Embryo development
c) No of gills
d) Endoskeleton

• A. All of these
• B. b,c,d
• C. a,b,c
• D. only c&d

Answer 1

The correct option is B b,c,d

Betta fish is also known as Siamese Fighting Fish. They are members of the class Teleostei, bony fish and the order Anabantoidei, which are more commonly known as labyrinth fish. These species have a specialized bone structure that allows them to breathe atmospheric air.
Carcharodon is a genus of sharks within the family Lamnidae. The only extant member of the genus is the great white shark. All sharks and ray fishes are cartilaginous fishes. Their endoskeleton is made up of cartilage.
Bony fishes and cartilaginous fishes have a two-chambered heart. But they differ in endoskeleton, mode of development and no of gills as well. Bony fishes have an endoskeleton made up of bones, 5pairs of gills which are covered with an operculum and fertilization is external.
Cartilaginous fishes have a cartilaginous endoskeleton, gill slits open and not covered by the operculum, fertilization is internal.