Question

The infective stage of Fasciola hepatica to sheep is?
A. Sporocyst
B. Cercaria
C. Metacercaria
D. Hexacanth

Answer 1

Hint: Fasciola hepatica, otherwise called the normal liver accident or sheep liver accident, is a parasitic trematode (accident or flatworm, a sort of helminth) of the class Trematoda, phylum Platyhelminthes.

Complete answer:Fasciola hepatica, contaminates the livers of different warm blooded creatures, including people. The ailment brought about by the accident is called fasciolosis or fascioliasis, which is a sort of helminthiasis and has been delegated as an ignored tropical illness. Fasciolosis is presently delegated a plant/food-borne trematode contamination, regularly obtained through eating the parasite's metacercariae encysted on plants.F. hepatica, which is conveyed around the world, has been known as a significant parasite of sheep and steers for quite a long time and causes critical financial misfortunes in these animal species, up to £23 million in the UK alone. Due to its generally huge size and monetary significance, it has been the subject of numerous logical examinations and possibly the most popular of any trematode species. F. hepatica's nearest relative is Fasciola gigantica. These two accidents are sister species; they share numerous morphological highlights and can mate with one another.
The metacercariae are delivered from the freshwater snail as cercariae and structure growths on different surfaces including amphibian vegetation. The mammalian host at that point eats this vegetation and can get contaminated. People can frequently gain these diseases through drinking tainted water and eating freshwater plants, for example, watercress. Inside the duodenum of the mammalian host, the metacercariae are delivered from inside their pimples. From the duodenum, they tunnel through the coating of the digestive tract and into the peritoneal cavity. They at that point move through the digestive organs and liver, and into the bile pipes. Inside the bile pipes, they form into a grown-up fluke. In people, the time is taken for F. hepatica to develop from metacercariae into a grown-up accident is around 3 to 4 months. The grown-up accidents would then be able to deliver up to 25,000 eggs for each accident every day. These eggs are passed out through stools and into freshwater. Once in freshwater, the eggs become embryonated, permitting them to bring forth as miracidia, which at that point locates an appropriate moderate snail host of the Lymnaeidae family.
Hence, option C is the correct answer

Note: The miracidia form into sporocysts, at that point to rediae, at that point to cercariae. The cercariae are delivered from the snail to shape metacercariae and the existence cycle starts once more.