Question

The yolk plug is a structure in gastrula which is formed by the protrusion of
A) Endodermal cells
B) Endo-mesodermal cells
C) Ectodermal cells
D) Mesodermal cells

Answer 1

By the end of gastrulation, blastocoel will be reduced. A yolk plug of endodermal origin closes the blastopore

so A is the correct answer

I hope it will help you
regards