Question

Rhabditiform larva occurs in
(A) Neries
(B) Ascaris
(C) Taenia
(D) Fasciola

Answer 1

Hint: Ascaris lumbricoides is a nematode or the parasitic worm that is present in the small intestine of the human. This worm can cause the infection called ascariasis. About ten percent of the world is affected by the ascaris disease.

Complete answer:
This rhabditiform larva mainly occurs in the nematodes. This nematode includes the roundworm, and the unsegmented body belonged to the phylum nematodes. These parasitic nematodes are also called eelworms. Some of the nematodes include Ascaris lumbricoides, ancylostoma duodenale, ascaris, trichuris etc. The rhabditiform larvae occurs in the parasite Ascaris. When the eggs of these parasites’ breaks, the rhabditiform larvae come out of the shell. From there they move to the liver through the circulation of the blood it travels to the heart in the pulmonary circulation. At last they reach the lungs and moult there. After that they again reach the small intestine through the blood circulation. In the intestine, they grow into the sexually matured ones. The growth of this larva takes place in four processes.

(1) It grows into the egg shell
(2) After that the second moulting takes place in the lungs
(3) The third growth and maturation take place in the intestine

Hence the correct answer is option(B)

Note: This disease of ascariasis is common in places without sanitary hygiene. It’s caused by contaminated food and water. This worm mainly affects the lungs and the intestine. Thus, the symptoms of this disease are coughing, fever, mucous blood and shortness of birth and diarrhea, vomiting and nausea.