A group of researchers procured some fish-like animals and …

Biology NEET Previous Year Question Paper NEET 2026 Previous Year Question Paper Single Correct MCQ

Published on: August 21, 2026

A group of researchers procured some fish-like animals and upon investigation the following characters were observed:

Endoskeleton was made of cartilage.
Scoliodon sp .

Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth.
Exocoetus sp.

Paired fins and scales were absent, but 7 pairs of gill slits were present.
Which of the following species of animals did they consider to fit best with these characters?
Petromyzon sp.

Branchiostoma sp.

Text Solution

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The correct answer is:

Petromyzon sp. (Lamprey).

These characters identify it as a member of the class Cyclostomata:

• Circular sucking mouth: Used for its ectoparasitic lifestyle.

• No scales or paired fins: Distinguishes it from true fishes.

• 7 pairs of gill slits: Typical for respiratory exchange in lampreys.

• Cartilaginous endoskeleton: Common to this primitive group.

Scoliodon (Shark) has jaws and scales, while Exocoetus (Flying fish) has a bony skeleton and scales.

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