NEET 2026 Zoology Cyclostomata MCQ Question
A group of researchers procured some fish like animals and upon investigation the following characters were observed:
A. Endoskeleton was made of cartilage.
B. Ectoparasitic; as they were found attached on fish skin with their circular sucking mouth.
C. 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?
Scoliodon sp.
Petromyzon sp.
Exocoetus sp.
Branchiostoma sp.
Correct Answer
Detailed Explanation
Petromyzon sp. have cartilaginous endoskeleton. They have circular sucking mouth. They are ectoparasites on some fishes. Their body is devoid of scales and paired fins. They have 7 pairs (6-15 pairs) of gill slits. Scoliodon and Exocoetus are not parasites.
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