Question

In the development of frog, the gastrulation process involves -
a. Invagination
b. Emboly
c. Epiboly
d. All of the above

Answer 1

Gastrulation is the method during embryonic development that transforms the embryo from a blastula with a sole layer of cells to a gastrula having multiple layers of cells. Gastrulation classically includes the blastula folding in upon itself or dividing, which creates two layers of cells.

Complete answer:
Gastrulation is a phase before time in the embryonic development of most animals, during which the solo-layered blastula is rationalized into a trilaminar structure called the gastrula. These three germ layers are called the ectoderm, mesoderm, and endoderm. In the frog, these layers are created by the processes of epiboly, emboly, and invagination.

Emboly means gastrula formation by plain invagination of the blastula wall. Epiboly depicts one of the five major kinds of cell movements that happen in the Gastrulation stage of embryonic development of a few organisms. Epibolic movement is the way in which a layer epithelial cell widens.

Invagination is a method that takes place during gastrulation. This method or cell movement happens chiefly in the vegetal pole. Invagination consists of the folding of an area of the external sheet of cells to the inside of the blastula.

Hence, the correct answer is option (D).

Note: Gastrulation spots the point in progress that the internal cells are separated from the cells that will cooperate with the environment. The archenteron, or gut, produces during gastrulation. The singular opening to the gut is called the blastopore. In jellyfish, it acts as both the mouth and the anus. In higher animals, a second notch develops during the arrangement of the internal organs.