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Question

Which one of the following is a protochordata?

A
Amphioxus
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B
Petromyzon
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C
Labeo
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D
Exocoetus
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Solution

The correct option is B Amphioxus
Protochordata is an informal category of animals that includes the subphyla Urochordata and Cephalochordata (both now grouped under Phylum Chordata).
Amphioxus belongs to the subphylum Cephalochordata, hence, it is a protochordate.
Petromyzon or Lamprey is a jawless vertebrate. Labeo and Exocoetus are both fish and belong to Pisces.
Thus, the correct option is A.

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