Which of the following statements are correct | vedclass

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(A) The characteristics of Class $Cyclostomata$ are as follows:$1$. They are ectoparasites on some fishes.$2$. They have an elongated body bearing $6-

Vedclass · Accepted Answer

$I, II, III, IV$

Vedclass · Answer

(A) The characteristics of Class $Cyclostomata$ are as follows:$1$. They are ectoparasites on some fishes.$2$. They have an elongated body bearing $6-15$ pairs of gill slits for respiration.$3$. They have a sucking and circular mouth without jaws ($I$ is correct).$4$. Their body is devoid of scales and paired fins ($II$ is correct).$5$. Cranium and vertebral column are cartilaginous ($III$ is correct).$6$. Circulation is of closed type ($IV$ is correct).$7$. $Cyclostomes$ are marine but migrate for spawning to freshwater. After spawning, within a few days, they die. Their larvae, after metamorphosis, return to the ocean ($V$ is incorrect as it states they live in freshwater and spawn in the ocean, which is the reverse).$8$. They show indirect development (larval stage is present, so $VI$ is incorrect).Therefore, the correct statements are $I, II, III,$ and $IV$.

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