Which of the following statements are correct | vedclass

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(B) 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

$I, II, IV$

Vedclass · Answer

(B) 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 (not bony,so $III$ is incorrect).$6$. 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 $I, II,$ and $IV$.

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