1. Tardigrade
  2. Question
  3. Biology
  4. Consider the following statements. I. Lancelets are jawless, primitive fish-like vertebrates. II. In lancelets, notochord, tubular nerve cord and pharyngeal gill slits are present throughout their life.

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Q. Consider the following statements.
I. Lancelets are jawless, primitive fish-like vertebrates.
II. In lancelets, notochord, tubular nerve cord and pharyngeal gill slits are present throughout their life.

Animal Kingdom

Solution:

Both statement I and II are true. Lancelet or Branchiostoma or Amphioxus (a jawless fish) is a protochordate. It belongs to group-Cephalochordata. The general characters of protochordates are the presence of dorsal tubular nerve cord, notochord and pharyngeal gill slits throughout their life.