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

Options

  1. AIt is present only in larval tail in Ascidians
  2. BIt is replaced by a vertebral column in adult frog
  3. CIt is absent throughout life in humans from the very beginning
  4. DIt is present throughout life in Amphioxus

Correct answer

C. It is absent throughout life in humans from the very beginning

Step-by-step solution

The notochord is a flexible rod-like structure that forms the main support of the body in the lowest chordates. It is not absent in humans throughout their life. The notochord is present in the embryonic stage and gets changed or replaced by the vertebral column in the adult.

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