Question

Which of the following structure is called as pre-embryo?

• A. Morula
• B. Blastula
• C. Gastrula
• D. None of the above

Answer 1

The correct option is B Blastula

Blastula represents the first important stage after the fertilization and plays an important role in the development of organisms. It is a hollow, spherical, one celled thick structure formed by the process called as blastulation. The continuous development of blastula finally results the gastrula. The conversion process of the blastula into gastrula is called as ‘gastrulation’. Gastrulation is followed by the organogenesis. Blastula is often called as a pre-embryo, whereas gastrula is referred to as a mature embryo.

Thus, the correct answer is option (B).