Completion of gastrulation is indicated by

Obliteration of archenteron

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Obliteration of blastocoel

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Closing of blastopore

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Closing of neural tube

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Solution

The correct option is B Obliteration of blastocoel
The word gastrulation means formation of a gut. Gastrulation varies from species to another but usually it involves a process of invagination at one end of blastula which results in the formation of two layered cup shaped gastrula. Gastrulation results in the virtual obliteration of blastocoel and its replacement by a new cavity, the archenteron or primitive gut. Hence, option B is correct.

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