NEET BIOLOGY

Detailed explanation-1: -Chondrichthyes is a class of jawed fishes having a cartilaginous skeleton. The class includes a diverse group of fishes including sharks, rays, skates and chimaeras.

Detailed explanation-2: -Rays, skates, and sharks all belong to the class Chondrichthyes (Greek, chondro meaning cartilage and ichthosmeaning fish). Characteristics of Chondrichthyes include a skeleton made of cartilage, jaws, paired fins, and paired nostrils.

Detailed explanation-3: -The sharks, rays, and chimaeras make up the second group of fish, the Class Chondrichthyes. Sharks are one of the earliest known jawed fishes. They have an upper and lower jaw made of cartilage.

Detailed explanation-4: -Sharks are a special type of fish known because their body is made out of cartilage instead of bones like other fish. The classification of this type of fish is “elasmobranch.” This category also includes rays, sawfish, and skates.

Detailed explanation-5: -Cartilaginous fish are fish that have a skeleton made of cartilage, rather than bone. All sharks, skates, and rays (e.g., the southern stingray) are cartilaginous fish. These fish all fall into the group of fish called the elasmobranchs.