Notochord is present throughout life in___________?
Correct answer: B. Cephalochordates
- A. Urochordates
- B. Cephalochordates
- C. Chordates
- D. Vertebrates
Explanation
In cephalochordates, such as Amphioxus, the notochord extends from the head region to the tail and remains present throughout life. In urochordates it is mainly a larval feature, and in vertebrates it is largely replaced by the vertebral column. Students may choose c because all listed groups are chordates, but not every chordate retains the notochord for life.
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