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Choose the correct option from the list which is not an example of cartilaginous fish:
A) Sawfish
B) Stingray
C) Rohu
D) Shark

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Last updated date: 29th Mar 2024
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MVSAT 2024
Answer
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Hint: Fish are gill-bearing aquatic creatures with no digits on their limbs.Depending on the exoskeleton, fishes are of two types- bony and cartilaginous. The cartilaginous fishes are jawed vertebrates.

Complete answer:
Depending on the endoskeleton of the fish, the fish is divided into two types- Bony (body made up of bones) and cartilaginous(made up of cartilage).

Chondrichthyes are the class for cartilaginous fish. They're mostly made up of cartilage. Cartilaginous fish have openings in their gills that allow them to access the ocean. Cartilaginous fish may also use spiracles instead of gills to breathe. All rays, skates, and certain sharks have spiracles on the tops of their heads. The fish may lie on the ocean floor and take oxygenated water in via the top of their heads, allowing them to breathe without inhaling sand. Examples of cartilaginous fishes are Ray fish, shark, sawfish etc.

Sawfish is a marine cartilaginous endoskeleton-containing fish that belongs to the class Chondrichthyes. Carpenter sharks are another name for them.

In the case of bony fish, the endoskeleton is made up of bones. Bony fish are called osteichthyes. Rohu is a bony fish that has a bony endoskeleton. It has four pairs of gills on each side, which are covered by the operculum. It's a large, omnivorous river fish. Salmon, flying fish, sea horse, rohu, and trout are examples of bony fishes (Osteichthyes).

Thus, Rohu fish is not an example of cartilaginous fish. The correct answer is ‘C’,

Note: Bones and cartilage are the connective tissues present in the body of an animal. Bones are relatively hard and rigid whereas c cartilage is soft and flexible. The bones help in the movement whereas the cartilage provides support, shape and structure to the tissues.