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Presence of notochord in any stage of the life cycle is a major chordate characteristic. Notochord is a cartilaginous skeletal rod supporting the body in all embryonic and some adult chordate animals.

1. a) True for all chordates
2. b) True for vertebrates only
3. c) True for invertebrates only
4. d) True for some chordates

Correct answer: a) True for all chordates

Solution

A notochord is a defining feature of chordates and is present at least during embryonic development in all chordates. In many vertebrates it is later replaced by the vertebral column, but its presence at some stage makes the statement true for all chordates.

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