Question

Jaw-less fishes belong to which group

• A. Chondrichthyes
• B. Osteichthyes
• C. Agnatha
• D. Pisces

Answer 1

The correct option is C

Agnatha

The correct option is C

Explanation of correct option

1. The group of jaw-less fishes is known as Agatha.
2. Agnatha is an infraphylum of jaw-less fish in the phylum Chordata and subphylum Vertebrata.
3. The two extant groups of jaw-less fish are hagfish and lamprey.

Explanation of incorrect options:

Option A: Chondrichthyes are a class of cartilaginous fishes that have an endoskeleton made up of cartilage.

Option B: Osteichthyes are a class of bony fishes that have skeletons made up of bone.

Option D: Pisces are permanently aquatic vertebrates that have gills for respiration and lack a true spine. They may be fresh water or marine.

Final answer: Jaw-less fishes belong to Agnatha group.