Question

The process by which the embryoblast cells give rise to an embryonic stage consisting of the germinal layers is called ___________.

• A. blastulation
• B. gastrulation
• C. pregnancy
• D. implantation

Answer 1

The correct option is B gastrulation

Gastrulation is the process by which the embryoblast cells give rise to gastrula that consists of the three germinal layers, ectoderm, endoderm and mesoderm.

Blastulation is the formation of blastocyst between 5-14 days after fertilization.
Pregnancy or gestation is the entire duration from fertilization to parturition. Implantation is the attachment of the blastocyst to the uterine endometrium.