epiblast is a layer formed by differentiation in the inner mass cell.cells at the posterior end of this epiblast form a bulge called primitive streak.gives rise to embryonic mesoderm and ectoderm

forms because of the expension of the epiblast layer

True cotyledones are lacking in monocots, However, it is represented by scutellum and epiblast in most of the monocot seeds.

It becomes the embryo proper and some extra-embryonic membranes. First it specializes into an epiblast and hypoblast. The epiblast becomes the embryo proper and the hypoblast becomes the yolk sac.

Trophoblast