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Question

In which of the following notochord is replaced by bony vertebral column in adult?

A
Ascidia
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B
Branchiostoma
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C
Petromyzon
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D
Labeo
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Solution

The correct option is D Labeo
  • Presence of notochord is a characteristic feature of all chordates.
  • The members of sub-phylum Vertebrata possess notochord during the embryonic stage.
  • In vertebrata adult form the notochord is replaced by a cartilaginous or bony vertebral column.
  • While in members of other Sub-phyla of Chordata the notochord remain as such.
  • Hence, the correct answer here is option D as Labeo belongs to vertebrata.

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