Identify the correct option for Cyclostomata | vedclass

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Question

(A) The class $Cyclostomata$ includes jawless vertebrates. Key characteristics include: $1$. They have an elongated body bearing $6-15$ pairs of gill

Vedclass · Accepted Answer

Development indirect,$6-15$ pairs of gill slits,ectoparasites on some fishes

Vedclass · Answer

(A) The class $Cyclostomata$ includes jawless vertebrates. Key characteristics include: $1$. They have an elongated body bearing $6-15$ pairs of gill slits for respiration. $2$. They lack jaws (agnathans) and do not possess scales or paired fins. $3$. Their body is devoid of scales and paired fins. $4$. They are often ectoparasites on some fishes. $5$. Their circulation is of the closed type. $6$. They are marine but migrate for spawning to fresh water. After spawning,within a few days,they die. Their larvae,after metamorphosis,return to the ocean. Thus,the development is indirect. Comparing the options,option $A$ correctly describes the key features: indirect development,$6-15$ pairs of gill slits,and ectoparasitic nature.

Identify the correct option for $Cyclostomata$ $:-$

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