State the adaptive features of the class Chon | vedclass

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Question

(B) The adaptive features of $Chondrichthyes$ are as follows:$1$. They are cartilaginous fishes with a streamlined body.$2$. They lack an air bladder,

Vedclass · Accepted Answer

Presence of placoid scales and lack of air bladder

Vedclass · Answer

(B) The adaptive features of $Chondrichthyes$ are as follows:$1$. They are cartilaginous fishes with a streamlined body.$2$. They lack an air bladder,which is why they must swim constantly to avoid sinking.$3$. They possess placoid scales and their jaws are very powerful.$4$. Some members possess electric organs (e.g.,$Torpedo$) or poison stings (e.g.,$Trygon$).

State the adaptive features of the class $Chondrichthyes$.

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Assertion: Cartilaginous fish swim constantly to avoid sinking.
Reason: In cartilaginous fishes, the air bladder is absent.

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