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In which of the protochordate animals notochord extends upto head region?

(A) Cyclostomata
(B) Urochordata
(C) Hemichordata
(D) Cephalochordata

Answer

Answer: D
Protochordates are considered as the connecting link between vertebrates and invertebrates. These include three groups: Hemichordata, Urochordata and Cephalochordata.
  • In Hemichordata, notochord is like structure is found in the roof of the buccal cavity which is called stomochord.
  • In Urochordata, the notochord is usually present at larval stage and is restricted to tail. It disappears in the adult during retrogressive metamorphosis.
  • In Cephalochordata, the notochord is persistent throughout the life and extends from tail up to the head region.
  • Cyclostomata is a class under the subphylum Vertebrata in which notochord is replaced by the vertebral column.
So, the correct answer is D.
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