Question

Fasciola hepatica belongs to class
A.Tubellaria
B.Trematoda
C.Cestoda
D.Nematoda

Answer 1

We know that Fasciola hepatica , commonly called liver flukes is a common parasitic organism in humans. It belongs to the phylum Platyhelminthes that contains several parasitic flatworms.

Complete answer: Phylum Platyhelminthes contains flatworms which are called so because of their dorso-ventrally flattened body. Most of them are endoparasites that reside in mammals including humans. The body of these organisms are unsegmented and are bilaterally symmetrical. It means that body can be divided into two halves only in a single plane.
These organisms have hooks and suckers with them that helps them to suck nutrients from the host. They have specialized cells known as flame cells. They are excretory organs and its flickering action of the cilia inside helps to excrete waste materials through an opening called nephridiopore.
Fasciola hepatica or liver fluke belongs to the class Trematoda. It got the name liver fluke because it infects the liver. It enters our body through contaminated water or food and causes diseases. The symptoms of the disease include fever, nausea, vomiting, headache, etc. After infection, it harbors inside the bile duct for a long period and causes problems. It can even lead to cancer of bile ducts.
We know that Cestoda is another important class of Platyhelminthes. It consists of tapeworms that are parasitic worms seen in the intestines. Infection may either be concentrated in the intestine or can be transmitted to other organs. The mode of infection is through contaminated food and water.
Hence the correct option is B.

Note: Nematodes are roundworms that are maybe free-living or parasitic in nature. It has a complete alimentary canal having a muscular pharynx. They are called roundworms as they are cylindrical in cross-section.