Question

The type of coelom found in Nereis is:
A. Acoelom
B. pseudocoelom
C. Enterocoelom
D. Schizocoelom

Answer 1

Hint: It is an invertebrate animal that possesses a coelom that is the body cavity lying between the digestive part and the body wall that formed through the splitting of the middle layer of the embryonic tissue. It is mostly ringworms, and segmented worms that include nereis and it is a true coelom.

Complete answer:
Before we start there is small information about Annelida from phylum called by the name of the worms that look like a segmented body, and they are mostly invertebrate animals in the member of the phylum family. Its characteristics are its possession of body cavity, bristles that are movable and a body divided into segments by transverse rings.
 Now let’s see the scientific classification. It is from the kingdom of Animalia, It’s from the phylum called Annelida, Its class is Polychaeta, Its order is Errantia, its comes under the family called Nereididae, and its genus is Nereis.
As we explained above this nereis belongs to the Phylum name Annelida. This Nereis also belongs to the coelom called Schizocoelom. It is nothing but a body cavity that is a perivisceral cavity that makes an outer parietal peritoneum and the inner side surrounds the alimentary canal. This coelom is then divided into compartments by intersegmental septa and is filled with coelomic fluid that contains amoeboid coelomocytes. By splitting it formed the mesodermal embryonic tissue.
Now we will solve this question by eliminating the wrong answer first then justifying the right answer.
Begin with option A: acoelom this is invertebrate that does not have a coelom, so this is the wrong answer.
For Option B: Pseudocoelom. This is also known as false coelom. This is between the mesoderm and the endoderm. So these are the wrong answers.
For Option C: Enterocoelom This is the wrong answer because animals belonging to some other animal phylum called chordata and Echinodermata.
For Option D: Schizocoelomates. This is the correct answer because this belongs to true coelom. Animal belongs to a phylum called Annelida.
So, the correct answer is “Option D”.

Note:
For solving these types of questions we should know phylum names clearly and this belongs to true coelom and the phylum called Annelida. There are three types of coeloms : Acoelomate, Pseudocoelomate, Eucoelomate. Its shape is a cylinder like structure. Its body is so long, and has a length of 5 to 30 cm. It is commonly called as rag worms or calm worms.