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Get Answers to all your Questions
- #Class 11
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Which one of the following statements is totally wrong about the occurrence of notochord,
while the other three are correct?
Option: 1
It is present only in larval tail in Ascidians
Option: 2
It is replaced by a vertebral column in adult frog
Option: 3
It is absent throughout life in humans from the very beginning
Option: 4
It is present throughout life in Amphioxus
Answers (1)
Notochord:
- The name ‘Chordata’ is based on the presence of notochord at some stage or throughout the life cycle.
- It is a rod-like structure placed dorsally between the alimentary canal and nerve cord.
- It is derived from the mesoderm.
- In vertebrates, it is present during the embryonic development.
- It is then replaced by the vertebral column (spine) in the postnatal stage.
-
Notochord is present in humans during the embryonic stage.
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