Question

State the difference between Morulla and Blastula?


class 12th CBSE Biology sample paper

Answer 1

The difference between morula and blastula is to do with the different developmental stages of the egg. Major developmental stages of egg after the fertilization are zygote, morula, blastula, and embryo. Fertilization is an important biological process resulting in the first embryonic stage, the zygote. Formation of morula and blastula are considered as the early embryonic developmental stages of animals. After the formation of the zygote, it transforms to the next stage, called the blastula. This transformation process is governed by a unique embryological biological process called cleavage. During the cleavage, series of mitotic divisions take place in zygote to produce daughter cells, which are genetically similar to their parent cell. These new daughter cells are now called blastomeres. With the time, morula differentiates into blastula, which has a higher cell number and different structure. In this article, differences between morula and blastula will be outlined.

Answer 2

Morulla:
1)It is a solid sphere of cells formed by cleavage of zygote.
2)It has 16 identical cells that is known as blastomeres.

Blastulla:
1)It is a hollow sphere of cells having a central cavity called blastocoel.
2)it has outer cell layers tropoblast and inner cell mass.