alleryPetromyzon and Myxine, which have a jaw-less mouth fitted with a sucker, belong to which class?
AAmphibia
BChondrichthyes
CCyclostomata
DReptilia
Answer & Solution
Correct answer: C. Cyclostomata
1. These animals have a jaw-less mouth with a sucker and no scales.
2. Such jaw-less vertebrates form class Cyclostomata.
3. Rule out Pisces: fishes have jaws and scales.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology Part 2, Ch 6 "Animal Classification", p.82_
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