Which statement about gastrulation in amphibians is true?
A) Gastrulation increases the number of germ layers from one to three.
B) The inward movement of mesoderm and endoderm creates the blastocoel.
C) Mesoderm forms by epiboly.
D) Inwardly moving bottle cells create the dorsal lip of the blastopore.
E) Prior to invagination, cells flatten at the vegetal pole.

Question

Quizplus · Accepted Answer

Inwardly moving bottle cells create the dorsal lip of the blastopore is true for gastrulation in amphibians.

The other statements are not true. A) Amphibians start out with two germ layers (ectoderm and endoderm), and gastrulation creates a third germ layer (mesoderm). B) The inward movement of mesoderm and endoderm does not create the blastocoel, but rather fills it in. C) Mesoderm forms by involution, not epiboly. E) Prior to invagination, cells at the vegetal pole do not flatten, they actually elongate.

Which Statement About Gastrulation in Amphibians Is True