Class Chondrichthyes, Elasmobranchii and Holocephali
Sharks have a cartilaginous structure and it may become
calcareous
partially ossified
completely ossified
lignified
partially ossified
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Sharks, ratfishes, and rays are included in classA. chordata
B. Chondrichthyes
C. elasmobranchii
D. Holocephali
Pharyngeal slits in member of subclass Holocephali is covered with:
A. lid
B. lobe
C. operculum
D. jaws
In members of subclass Holocephali, teethes are modified into:
A. dentine
B. jaws
C. crushing plates
D. tail
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