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प्रश्न
Skeleton is made entirely of cartilage in
विकल्प
Sharks
Tuna
Rohu
None of these
उत्तर
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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