NEET 2011 Biology question

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 beginingCorrect
(4)It is present throughout life in Amphioxus

Answer: (3)

Solution

Notochord is a defining feature of phylum Chordata. In urochordates (Ascidia) it is present only in the larval tail (option 1 true). In cephalochordates (Amphioxus/Branchiostoma) it persists throughout life (option 4 true). In vertebrates, including

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Question ID VK-090690