Question

During embryonic development, the correct order of events is

• A. Morula $\to$ cleavage $\to$ blastula $\to$ gastrula
• B. Cleavage $\to$ morula $\to$ blastula $\to$ gastrula
• C. Cleavage $\to$ gastrula $\to$ blastula $\to$ morula
• D. Blastula $\to$ cleavage $\to$ gastrula $\to$ morula
• E. Morula $\to$ blastula $\to$ cleavage $\to$ gastrula

Answer 1

The correct option is B Cleavage $\to$ morula $\to$ blastula $\to$ gastrula

Fertilization is a crucial biological process which includes an orderly series of physiochemical events. Cleavage is a unique embryological process that transforms the fertilized ovum into a solid mass of cells known as morula. Later the morula develops a cavity around which the cells are arranged. The structure thus formed is known as blastocyst. As the blastocyst develops further it gives rise to the tissues and organs of the embryo.

So, the correct answer is option B.