Multiple choice

Which of the following is a protochordate?

  1. Asterias

  2. Amphioxus

  3. Chiton

  4. Echinus
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Amphioxus (Branchiostoma) belongs to Cepalochordata, a sub-group of protochordates characterized by a notochord extending the entire body length. Asterias and Echinus are echinoderms (starfish and sea urchins), while Chiton is a mollusk - none possess the defining notochord structure.

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