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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.
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(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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