In which of the following is a notochord present in the embryonic stage?
Correct answer: A. All chordates
- A. All chordates
- B. Some chordates
- C. Vertebrates
- D. Non chordates
Explanation
•Chordates are the animals that have a notochord, a skeletal rod, present at some stage in the life cycle. •In lower vertebrates, the notochord persists throughout life while in higher vertebrates it is replaced by vertebral column in adults. •Nonchordates never develop a notochord, not even in the embryonic stage.
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