A) It is present only in larval tail in Ascidians
B) It is replaced by a vertebral column in adult frog
C) It is absent throughout life in humans from the very beginning
D) It is present throughout life in Amphioxus
Correct Answer: C
Solution :
The notochord is a flexible, rod-shaped body found in embryo of all chordates. It is composed of cells derived from the mesoderm. It represents the primitive axis of embryo. In some chordates, it persists throughout life as the main axial support of the body (e.g.. Amphibians), while in most vertebrates including humans it becomes the vertebral body of the vertebral column.
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