Question

The cavity, which formed during gastrulation, is named as-
A. Blastocoel
B. Archenteron
C. Coelom
D. Pseudocoel

Answer 1

Hint: Gastrulation involves dividing of the cells of blastula to form gastrula. Gastrula is a multilayered structure of cells. The only cavity developed during gastrulation covers the central region of the blastula.
The cavity formed, further replicates itself into two layers called- endoderm and mesoderm. This cavity also helps in formation of the digestive tract and it opens at the blastopore.

Complete answer:
-In a developing zygote, when the primary gut is formed during gastrulation, it is called “Archenteron”.
-Archenteron is also called “the digestive tube” as it further develops into the cavity of the digestive tract. It is also called “gastrocoel”.
-The endoderm and the mesoderm of an animal are formed from archenteron.
-Archenteron is formed at the embryonic stage during gastrulation.
-Archenteron opens at blastopore and connects to outside through it. Blastopore might convert into the mouth or anus of the animal.
-The fluid filled in the centre of the blastula is known as “Blastocoel”. It formed at the time of embryogenesis and is the first cavity formed after the zygote divides around sixteen to thirty two times.
When mesoderm splits, it forms “Coelom”. Because of that, Coelom is also called the secondary body cavity. Coelom surrounds the digestive tract and other organs in order to protect them and helps the independent growth of the body organs irrespective of the body mass of the animal or the organism. Coelom might as well act like a skeleton as in worms.
-Pseudocoel or pseudocoelom is a false cavity which is not formed due to gastrulation. It is a cavity formed by the division of Blastocoel.

Finally, we got Archendron as the cavity inside the fetus at a stage of gastric development. Finally, it will be the digestive cavity. The body cavity is the coelom. It is lined by epithelium derived from the mesoderm. One of the body cavities is the pseudocoel. It is not a gastrulation product. And it is not defined as a line with a mesodermal membrane.

Hence, the correct answer is option (B).

Note: Coelom is the inner body cavity which is created after the formation of archenteron i.e. after archenteron develop, Coelom is developed through the layers developed from archenteron. Hence the cavity during gastrulation is “archenteron” and not “Coelom”. Coelom is formed by the division of mesoderm and mesoderm is formed by the division of archenteron. Hence the birth of Coelom takes place after gastrulation.