The embryo forms from the
A) placenta.
B) morula.
C) inner cell mass of the blastocyst.
D) outer layer of the blastocyst.
E) zona pellucida.

Question

Quizplus · Accepted Answer

The inner cell mass of the blastocyst gives rise to the embryo.

Note: A, D, and E are incorrect as they are not directly involved in the formation of the embryo. The placenta is an organ formed by both maternal and fetal tissues, the outer layer of the blastocyst forms the trophoblast (which later contributes to the formation of the placenta), and the zona pellucida is a glycoprotein layer surrounding the oocyte and early embryo. B is incorrect as the morula is a pre-blastocyst stage consisting of a solid ball of cells and is not directly involved in the formation of the embryo.

The Embryo Forms from the