Question

Miracidium is the larval stage of
A. Tapeworm
B. Roundworm
C. Pinworm
D. Liver fluke

Answer 1

Hint: They develop into the liver tissue. They are infectious and can cause fasciolosis. They develop in snails (host) mostly. It causes inflammatory disease of bile.

Complete answer:
What is a larva? A larva is an immature form of an insect or worm. It is a juvenile form of many animals before turning into adults.

Let us learn what the larvae of the options are called.
> Option A- Tapeworm: The larva of tapeworm is called cysticercus. It is a fluid-filled sac in the host. It can cause cysticercosis if ingested by a human.

> Option B- Roundworm: A rhabditiform is the larva of a roundworm (Ascaris lumbricoides). Ascariasis is the infection caused if the roundworm is somehow ingested. It develops in the intestine.

> Option C- Pinworm: It is a nematode and is also called threadworm. It is a parasitic worm that lives in the large intestine of humans. They are 1.5 inches long. The infection caused by them is called enterobiasis. The female pinworm lays its egg in the intestine and on the skin around the anus.

> Option D- Liver fluke: People sometimes eat the water plants infected by the immature parasitic larva. This larva moves from the intestinal canal to the liver tissue, into the bile ducts, developing into mature adults there and laying the eggs. The larval stage of fluke is called miracidium.

So the answer is option D: Liver fluke

Note: Larva is capable of feeding themselves. They are motile. After hatching from the egg, the larval stage occurs followed by the adult stage. The physical appearance of the larva largely differs based on the species. Larvae look completely different from their adults mostly.