Identify the chordates in which the notochord persists in the adult?

Tunicates

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Lancelets

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Cartilaginous fishes

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Bony fishes

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Solution

The correct option is B Lancelets
The notochord is a rod-like structure made up of large vacuolated cells. It lies below the nerve cord and above the alimentary canal. The notochord persists throughout life in sea lancelets. In vertebrates, it is only found in the embryo, and replaced by a vertebral column in adults.
The correct answer is option B.

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