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Question
Skeleton is made entirely of cartilage in
Options
Sharks
Tuna
Rohu
None of these
Solution
Sharks
Explanation -
The cartilaginous fish bear a cartila¬ginous endoskeleton i.e. the endoskeleton which is made entirely of cartilage, e.g. sharks (Scoliodon, etc.)
In the bony fish, the endoskeleton is cartilaginous in the embryonic stage, but in adults, it is replaced by bones. Thus they have a bony endoskeleton, e.g., Rohu, Tuna etc.
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