Which of the following animals possesses open | vedclass

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Question

(A) The animals belonging to the class $Chondrichthyes$ (cartilaginous fishes),such as sharks,possess gill slits that are separate and not covered by

Vedclass · Accepted Answer

Shark

Vedclass · Answer

(A) The animals belonging to the class $Chondrichthyes$ (cartilaginous fishes),such as sharks,possess gill slits that are separate and not covered by an operculum (gill cover). In contrast,members of the class $Osteichthyes$ (bony fishes),such as $Catla$,$Labeo$,and $Hippocampus$ (seahorse),possess four pairs of gills which are covered by an operculum on each side. Therefore,the shark is the correct answer as it has open gill slits.

Which of the following animals possesses open gill slits?

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Which of the following has an endoskeleton made of cartilage?

Statement-$I$: Teeth of cartilaginous fishes are modified placoid scales which are backwardly directed.
Statement-$II$: Jaws of cartilaginous fishes are very powerful.

Statement $X$: Boat-shaped body,skin covered with placoid scales.
Statement $Y$: Mouth is generally ventral,jaws are generally toothed.

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