Question

Germinal layer formed from trophoblast of mammalian blastocyst is

• A. Ectoderm
• B. Endoderm
• C. Mesoderm
• D. None of the above

Answer 1

The correct option is D None of the above

The word trophe means nourishment. After the cleavage, a 64 celled stage is formed named as a blastula. The cavity of blastula is known as blastocoel. The cells are divided into 2 layers, outer trophoblast and inner cell mass. The trophoblast provides nourishment to the growing embryo and forms chorion and amnion. The inner cell mass gives rise to the three germ layers.

So, the correct answer is 'None of the above'.