Question

Gastrula is the embryonic stage in which _____________.

• A. Cleavage occurs
• B. Blastocoel form
• C. Germinal layers form
• D. Villi form

Answer 1

Answer: (C)

Germinal layers form

Transformation of the blastocyst into gastrula with primary germ layers by rearrangement of the cells is called gastrulation. In all the triploblastic animals three germ layers - ectoderm, mesoderm and endoderm are formed by characteristic movements of some of the cells known as morphogenetic movements.