Question

Which type of blastula occurs in frogs?
a. Stereoblastula
b. Coeloblastula
c. Holo Blastula
d. Amphiblastula

Answer 1

Hint: Inside the blastula of the frog, there is a fluid-filled cavity available. The outermost covering of this blastula is composed of a solitary layer of the cell. As related to the Stereoblastula which doesn't possess any cavity in it.

Complete answer:
Afterward, the cleavage has produced over 100 cells, the embryo is known as a blastula. The blastula is generally a spherical layer of cells (the blastoderm) enclosing a fluid-filled or yolk-filled cavity (the blastocoel).

> Coeloblastula, a phase of embryonic development; a kind of blastula. The coeloblastula is a feature of definiteCoelenterata, lower Arthropods, Echinodermata, Tunicatesand many Amphibia. It is produced as an outcome of whole radial cleavage (even or uneven). It looks like a bubble filled with fluid.

> Amphiblastula is a free-swimming larva of assured sponges that is a blastula with small flagellated cells in one hemisphere and large non-flagellated cells in the other.

> The holoblastic type of cleavage is normally seen in eggs having modest to the light amount of yolk. Animals with eggs that split holoblastically include the amphibians, mammals, echinoderms,

By stereoblastula, the embryo is shaped by spiral cleavage, occurring by the lack of a blastocoel; composed by embryos of Annelida worms, turbellaria flatworms, nemertean worms, and all molluscs excluding cephalopods.

Hence, the correct answer is option (B).

Note: Blastula, a hollow sphere of cells, or blastomeres, formed during the maturation of an embryo by continuous cleavage of a fertilized egg. The cells of the blastula create an epithelial (covering) layer, known as the blastoderm, enclosing a fluid-filled cavity, the blastocoel. After the blastula matures, it suffers transition to the gastrula, a process known as gastrulation. In organisms like mammals, the prior morula, a berrylike cluster of cells, transforms into a slightly different form of blastula, the blastocyst.