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Notochord

During the li...

Question

During the life of a tunicate, the notochord

A

Is present throughout life

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B

Appears in the larva only

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C

Develops during adulthood

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D

Is completely absent

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Solution

The correct option is B Appears in the larva only
Tunicates are marine invertebrate and are part of the phylum Chordata. They are classified as chordates as they possess a notochord during their tadpole-like larval stages. This notochord is only found in the early stages of their development and is lost in the adult as a part of metamorphosis.
So, the correct answer is 'Appears in the larva only'.

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Q. Notochord occurs only in larva of

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. Which of the following statements are true for the phylum - chordata?
(a) In urochordata notochord extends from head to tail and it is present throughtout their life.
(b) In Vertebrata notochord is present during the embryonic period only.
(c) Central nervous system is dorsal and hollow.
(d) Chordata is divided into 3 subphyla: Hemichordata, Tunicata and Cephalochordata.

Q. The notochord is present throughout the life in organisms belonging to which of the following group?

Q. Read the following statements.

(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.

Choose the option with only incorrect statements.

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