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

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

Correct answer: It is absent throughout life in humans from the very beginning

Solution

The wrong statement is the one claiming humans lack a notochord from the very beginning. In humans, the notochord appears early in embryonic development and later mostly disappears as the vertebral column forms.

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