A) Ectoderm
B) Endoderm
C) Mesoderm
D) Blastopore
Correct Answer: C
Solution :
Mesoderm is the layer of cells in the gastrula that lies between the ectoderm and endoderm. It develops into the muscles, circulatory system and sex-organs and in vertebrates also into the excretory system and skeleton. Ectoderm is the external layer of cells of the gastrula, which will develop into the epidermis and nervous system in adult. Endoderm is the internal layer of the cells of the gastrula, which will develop into alimentary canal and digestive and respiratory system of the adult. Archenteron is connected to the outside by the opening called blastopore, which becomes either the mouth, the mouth and anus or the anal opening of the animal.
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