Question

Coelom derived from blastocoel is known as
A: Pseudocoelom
B: Enterocoelom
C: Haemocoel
D: Schizocoel

Answer 1

In most mammals, the coelom is the primary body cavity that surrounds and contains the digestive tract and other organs. A coelom may act as a shock absorber or as a hydrostatic skeleton. Because of the cavity, internal organs may extend and travel independently of the outer body wall. Coelomic fluid is the fluid that exists inside the coelom.

Complete explanation:
Option A: A pseudocoelom is a fluid-filled space between the body wall and the digestive tract found in roundworms. Pseudocoelom develops from the embryo's blastocoel rather than a secondary cavity within the embryonic mesoderm (which leads to a real body cavity or coelom).
So, option A is correct.
Option B: Enterocoelom develops as a result of embryonic gut out pocketing (endoderm). This type of body cavity is created by primitive gut out pocketing that split off and form the coelom. Animals from the Phyla Echinodermata and Chordata are two examples.
So, option B is incorrect.
Option C: In certain species, the body cavity is reduced and filled with blood, giving rise to the term haemocoel. Haemocoel is found in species of the phylum Arthropoda and Mollusca. The fluid present in the circulatory system of phylum Arthropoda is haemocoel. The haemocoel has the ability to act as a hydrostatic skeleton. It serves as the circulatory system in insects such as grasshoppers.
So, option C is incorrect.
Option D: Schizocoel, a coelom (the body cavity between the alimentary canal and therefore the body wall musculature) formed by the splitting of the mesodermal mass, the centre embryonic tissue in embryonic development.
So, option D is incorrect.

So, option A is the correct answer.

Note:
The false body cavity that exists between the mesoderm of the body wall and the endoderm of the gut is known as pseudocoelom. Such a body cavity is known as a pseudocoelom, and the species that have them are known as pseudocoelomates. Aschelminthes, for example. Since there is no layer of mesodermal epithelium filling the cavity and protecting the organs, the internal organs of pseudocoelomate animals are located free inside the fluid-filled body cavity. The benefit of coelom is that a space filled with fluid around the organs acts as a hydrostatic skeleton, allowing for more effective circulation of nutrients and waste removal.