You observe an animal embryo that is more-or-less spherical in shape. Projecting from the surface along one 'side' of the embryo is a pair of ridges, separated by a shallow groove. A transverse section through the embryo, perpendicular to these ridges, shows that the interior of the embryo is a fluid-filled cavity, and that the body wall consists of three layers of cells. This embryo is undergoing
A) neurulation.
B) gastrulation.
C) morphogenesis.
D) involution.
E) cleavage.

Question

Quizplus · Accepted Answer

Neurulation is the process during which the neural plate forms into the neural tube, which is the precursor to the central nervous system. The pair of ridges separated by a shallow groove described in the scenario are indicative of the neural folds and the neural groove, respectively, which are key features of neurulation.

You Observe an Animal Embryo That Is More-Or-Less Spherical in Shape