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

Options

(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:

It is absent throughout life in humans from the very beginning

Explanation:

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 through out their life. Notochord is present in embryonic stage and get changed or replaced by vertebral column in the adult