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In which of the following animals is the notochord present only in the larval tail?

Options

  1. ABranchiostoma
  2. BBalanoglossus
  3. CAscidia
  4. DPetromyzon

Correct answer

C. Ascidia

Step-by-step solution

In Subphylum Urochordata (Tunicata), the notochord is present only in the larval tail. Ascidia , Salpa , and Doliolum are examples of Urochordata. Branchiostoma belongs to Cephalochordata, where the notochord extends from head to tail and is persistent throughout life. Balanoglossus is a Hemichordate, which lacks a true notochord but possesses a rudimentary stomochord. Petromyzon is a vertebrate (Cyclostomata), where the notochord is present during the embryonic stage. Answer: Ascidia

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