Question

In Cockroach, coelom is
A. Schizocoel
B. Enterocoel
C. Pseudocoel
D. Haemocoel

Answer 1

Hint: The space enclosed by the mesoderm in the true coelom or cavity of the body where internal organs are suspended. The true coelom is present in the cockroach. All the sides of true coelom are lined by the mesoderm layer. The food gets pushed inside by the digestive tract of muscles and allows efficient digestion.

Complete answer: When the body cavity lies between the digestive tract and the musculature of the body wall then this type of coelom is called Schizocoel. This is formed via mesodermal mass splitting in the cockroach. In embryonic development, it is the middle germ layer. Schizocoelom one part is attached to the ectoderm and the other part surrounds the endoderm. The mouth is formed by blastopore.
The embryonic gut wall develops Enterocoel in the cockroach and this will be found from Echinodermata to Chordata.
The body cavity which is not considered as the product of gastrulation is called pseudocoel. It is not lined by a properly defined membrane of mesoderm.
Hemocoel is also a body cavity of cockroach which lacks the coelomic epithelium lining and present around the viscera and also contains blood. In hemocoel blood vessels are developed badly and open into space.
So, the correct answer is “Option A”.

Additional Information:
There are 3 main sinuses of hemocoel by a dorsal and ventral horizontal diaphragm:
The sinus which surrounds the heart and aorta is called a pericardial sinus.
The sinus which surrounds different visceral organs is called a perivisceral sinus.
The sinus that surrounds the ventral nerve cord is called a perineural sinus.

Note:
Thus, Schizocoel is the coelom in cockroaches which is situated in the body cavity and helps in the food digestion properly. The higher metazones of the coelom in the body cavity is present between the body wall and intestine. The mesodermal epithelium lined this coelom. The mesodermal layer is an important part of this coelom.