Question

Which of the following character best suits
for the given figure ?
(A) Notochord persists throughout
life
(B) Notochord is present only in
larval tail
(C) Belongs to cephalochordate
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Answer 1

(a) Notochord persists throughout

life

Cephalochordate have notochord all along the body through out life. But urochordates have notochord in the tail region in their larval stage only.

Answer 2

Concept: Notochord: The longitudinal structure.

Answer:

(A) Notochord persists throughout life

Explanation:

• Notochord is cartilaginous skeletal midline or longitudinal flexible rod that supports the body of an embryo and some adult chordate animals. It provides the mechanical support and acts conduction system in the developing embryo.
• Notochord is replaced by vertebral column and cranium in the later stages of life in the most of the chordates.
• The notochord does not persist throughout life in all the chordates. It is present only in lower chordates and than only in the higher chordates called the Cephalochordates.
• Notochord runs longitudinally throughout the body from top to end, not just the larval tail.
• Yes, notochord does belong to cephalochordates, and is present in them throughout their lives.

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