After gastrulation, the roof of archenteron is formed by

Neural plate

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Mesoderm

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Ectoderm

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Chorda-mesoderm

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Solution

The correct option is D Chorda-mesoderm
Archenteron is the embryonic gut cavity, that is lined with the endoderm. Chorda-mesoderm is the longitudinal mid-dorsal group of mesoderm cells, that moves into the roof of the archenteron during gastrulation and gives rise to the notochord.
Thus, the correct answer is option D.

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