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Question

Gill slits persist throughout the life in


A

Hemichordata

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B

Cephalochordata

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C

Urochordata

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D

All of the above

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Solution

The correct option is B

Cephalochordata


The correct option is B.

Explanation of the correct option:

  1. The members of phylum Chordata possess a notochord, a pair of pharyngeal gill slits.
  2. Chordata phylum has subphyla: Urochordata, Cephalochordata and Vertebrata.
  3. Cephalochordata is mostly marine animals.
  4. So, they persist with the gill slits throughout their life.

Explanation of the incorrect options:

Option A:

  1. Hemichordata is worm-like marine animals.
  2. The body has an anterior proboscis, a collar, and a long trunk.
  3. Gills have a respiratory function.

Option C:

Urochordata is one of the subphyla of Chordata. The notochord is located only in the larval tail.

Option D:

Gill slits do not persist throughout life in Urochordata and Hemichordata.

Final answer: Gill slits persist throughout the life in Cephalochordata.


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