Question

Blastopore is the pore of
A. Archenteron
B. Blastocoel
C. Coelom
D. None of the above

Answer 1

Hint:-A diploid zygote is formed by the fusion of a haploid sperm and haploid ovum. The zygote undergoes mitotic division and slowly develops into a human foetus by passing through several stages. The different stages are morula, blastula, gastrula, etc. These stages differ in the number of cells and tissues in them.

Complete answer:
Archenteron can also be called a primitive digestive tube. It is a cavity formed during the gastrula stage of the embryo. The blastula folds inward to form the gastrula forming a gap called gastrocoel or archenteron. The area from where the cells folded inwards becomes the opening of the archenteron called the blastopore. Later a second opening also develops in the gastrula. Blastopore may either develop into the mouth or anus of the digestive tract.
Inside the blastula, there is the blastocyst. It is a hollow ball of cells. A blastocyst is a mass of cells that is differentiated into an outer trophoblast and an inner embryoblast. Blastocoel is the fluid-filled cavity formed inside the blastocyst. In gastrulation, cells of the blastula move inward like an invagination forming different layers called the germ layers. In humans, the development of three germ layers is seen, called triploblastic. The coelom is the internal body cavity derived from the mesoderm, which is a fluid-filled space between the visceral organs and body wall.
So, the correct answer is option A. Archenteron.

Note:- Blastopore may either develop into the mouth or anus of the digestive tract. According to the development of blastopore, organisms are classified as protostomes and deuterostomes. In protostomes, meaning mouth formed first, blastopore develops into the mouth, and in deuterostomes, meaning mouth formed second, blastopore develops into the anus. Higher animals like chordates are deuterostomes.