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2.Human Reproduction
normal
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
Solution
(a)By the end of gastrulation, blastocoel will be reduced. A yolk plug of endodermal origin closes the blastopore.
Standard 12
Biology