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.

Question

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. (A) I is true, but II is false (B) I is false, but II is true (C) Both I and II are true (D) Both I and II are false

Tardigrade Admin · Accepted Answer

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.

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.

I is true, but II is false

I is false, but II is true

Both I and II are true

Both I and II are false

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.

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.