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Q. Notochord is present throughout the life in

Odisha JEEOdisha JEE 2011Animal Kingdom

Solution:

Notochord persists throughout life in the lower chordates, but in the higher chordates, it is surrounded or replaced, partly or fully, in the adult by a jointed vertebral column.
In urochordata, notochord is present only in larval tail, while in cephalochordata (Amphioxus), it extends from head to tail region and is persistent throughout their life.