Question

Blastopore is found in
A) Blastula and opening of archenteron
B) Blastula and opening of blastocoel
C) Gastrula and opening of archenteron
D) Gastrula and opening of blastocoel

Answer 1

Hint:The reproduction process undergoes different stages during the process of formation of embryos after the fusion of male and female gametes. After the fusion the cell undergoes cell division to form blastula and gastrula to embryo.

Complete answer:
To answer this question, we have to know about different reproductive structures. Unlike cell structure, different animals have different reproductive structures. One of the features includes hermaphrodites, the animals that produce both sperms and eggs. They produce egg and sperm simultaneously with the help of sexual reproduction. In many animals the zygote undergoes mitotic cell division and forms two cells that are termed as embryos. The continued division of embryonic cells to form blastula. Animals like frogs go further division of cells to form gastrula. Gastrula is a two layer sac with an opening at one end formed in embryonic development. In some animals the zygote undergoes mitotic cell division and forms two cells that are termed as embryos. The continued division of embryonic cells to form blastula. Animals like frogs go further division of cells to form gastrula. It seems like a double bubble that means one bubble inside the bubble.
Now, we can conclude that, after formation of zygote it gets divided by cleavage that results in the formation of blastula. Later, gastrula is formed through invagination of endodermal cells inside the ectodermal cells. Archenteron cavity is found in gastrula that opens through a wide aperture that is termed as the blastospores, this blastospores later becomes the mouth.

Thus, the correct option is ‘C’. Gastrula and opening of archenteron.

Note:The blastocyst comprises a layer of trophoblastic cells that developed into the fetal part of the placenta that later develop into the embryo and a cavity called blastocoel that becomes the yolk sac.