Question

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 ascidian
• 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

Answer 1

Answer: (C)

Humans belong to the Phylum Chordata. Animals belonging to the Phylum Chordata possess a notochord either during early embryonic life or throughout the life. In some, it is replaced by vertebral column. In humans, notochord is present only in the embryonic stage, it is replaced by vertebral column in the adult form.