Choose the incorrect statements.
(I) Notochord is ectodermally derived tube-like structure.
(II) Notochord is formed on the dorsal side during embryonic development.
(III) The animals of Porifera to Echinodermata are without notochord.
(IV) In some chordates, notochord is replaced by the vertebral column and these chordates are called vertebrates.

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I and II

I, II and III

II, III and IV

I only

answer is D.

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Detailed Solution

Notochord is a mesodermally derived rod-like structure formed on the dorsal side during embryonic development in some animals.

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