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Chordata/Vertebrata

Which one of ...

Question

Which one of the following statement is/are totally wrong about the occurrence of the notochord, while the other three are correct?

A

It is absent throughout life in humans from the very beginning.

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B

It is present throughout life in Amphioxus.

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C

It is present only in larval tail in Ascidians.

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D

It is replaced by a vertebral column in adult frog.

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Solution

The correct option is A It is absent throughout life in humans from the very beginning.
Chordates show three fundamental characters- the presence of a notochord, a dorsal hollow nerve cord, and paired pharyngeal gill slits. Humans belong to class Mammalia.
So, the correct answer is option A.

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Q. In _______, notochord is present only in larval tail while in ________, it extends from head to tail region and is persistent throughout their life.

Q. Statement 1: Cephalochordata bears notochord all along the body throughout life.
Statement 2: Urochordate bears vertebral columns only in the tail region throughout life.
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(a) Three subphyla of phylum Chordata are Tunicata, Cephalochordata and Vertebrata.
(b) In Ascidia, notochord is present only in larval tail.
(c) Notochord persists throughout life in all vertebrates.
(d) Nerve cord is ventral, solid and double in chordates.

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Statements II: Urochordate bears vertebral column only in tail region throughout the life.

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