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Q.

Identify the animal with notochord in its larval tail but absent in adult

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a

Dentalium

b

Amphioxus

c

Doliolum

d

Lamprey

answer is C.

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Detailed Solution

Notochord is confined to larval tail in Doliolum – Urochordate.

Dentalium is a mollusc and non-chordate.

In Amphioxus, the notochord extended up to anterior portion of head and persists throughout the life.

Lamprey is a vertebrate in which the notochord also persists throughout the life along with vertebral column.

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