NEET 2002 Biology question

In which of the following notochord is present in embryonic stage : -

(1)All chordatesCorrect
(2)Some chordates
(3)Vertebrates
(4)Non chordates

Answer: (1)

Solution

Presence of a notochord at some stage of life is the defining feature of phylum Chordata, so all chordates have a notochord at least in the embryonic stage. In vertebrates it is replaced by the

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Question ID VK-089088