Q5 / 120 · NEET 2011 (Mains) · Botany

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

  • A
    It is present only in larval tail in Ascidians
  • B
    It is replaced by a vertebral column in adult frog
  • Correct answer
    C
    It is absent throughout life in humans from the very beginning
  • D
    It is present throughout life in Amphioxus

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.

Hence, the correct answer is option: 'C'.

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