Question

Internal nares are absent in

• A. Agnatha
• B. Chondrichthyes and Osteichthyes
• C. Chindrichthyes
• D. None of the above

Answer 1

The correct option is B Chondrichthyes and Osteichthyes

Agnatha is a class of Chordata phylum. These are the jawless vertebrates. They have two nostrils but nares are absent. Chondrichthyes are the class of cartilaginous fishes. They are jawed vertebrates. In this, external nares are present whereas internal nares are absent. Osteichthyes are the class of bony fishes. They are jawed vertebrates. In this, external nares are present whereas internal nares are absent.

Thus, the correct answer is option B.