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Q.

In which of the following vertebrate, the cranium and vertebral column are cartilaginous?

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a

Pterophyllum

b

Psittacula

c

Petromyzon

d

Pteropus

answer is C.

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Detailed Solution

Cranium and vertebral column are cartilaginous in the members of class-Cyclostomata. Petromyzon is a cyclostome.Pterophyllum is a bony fish. Psittacula is a bird. Pteropus is a mammal.  Bony fishes, amphibians, reptiles, birds and mammals have bony cranium and vertebral column.
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In which of the following vertebrate, the cranium and vertebral column are cartilaginous?