TRB PG Assistant - Structure and life history of helminth parasites – Fasciola, Taenia, Wuchereria, Ascaris One Line Questions & Answers

1. The filariform larva of Wuchereria bancrofti is characterized by: — A sharp, pointed tail and a long esophagus

2. A characteristic feature of the Taenia scolex is the presence of: — Suckers and/or hooks for attachment

3. The reproductive system of Fasciola hepatica is characterized by: — Hermaphroditism, with both male and female organs in each individual

4. The terminal part of the digestive tract in Fasciola hepatica is: — Absent

5. In Fasciola hepatica, the ventral sucker is also known as the acetabulum. What is its primary function? — Attachment to the host's tissues

6. What is the infective stage for the intermediate host (snail) of Fasciola hepatica? — Miracidium

7. Ascaris lumbricoides is a large intestinal roundworm. What is the infective stage for humans? — Egg with developed larva (larvated egg)

8. Which helminth parasite has a life cycle that typically involves two intermediate hosts? — Fasciola hepatica

9. The adult Ascaris lumbricoides lives in the: — Small intestine

10. In Taenia solium, the larval stage that develops in the intermediate host (pig) and is infective to humans is called: — Cysticercus

11. The 'bladder worm' stage of Taenia species is also known as: — Cysticercus

12. The liver fluke, Fasciola hepatica, belongs to which class of Platyhelminthes? —

13. Which of the following is NOT a typical feature of the adult Ascaris lumbricoides? — Presence of suckers

14. The development of microfilariae into infective larvae within the mosquito vector of Wuchereria bancrofti is an example of: — Indirect development with biological transmission

15. What is the primary way humans acquire infection with Ascaris lumbricoides? — Drinking contaminated water with eggs

16. The term 'cysticercosis' refers to an infection caused by which helminth parasite? — Taenia solium

17. Which of the following helminths is known for causing 'swimmer's itch' as a human health problem? — Schistosoma species (not in this list, but a common fluke example)

18. The intestinal lumen of the definitive host is the habitat of which adult helminth? — Taenia solium

19. Which of the following helminths is known for its pseudocoelom (false body cavity)? — Wuchereria bancrofti

20. Which of the following helminths has a life cycle that does NOT involve an intermediate host for humans to become infected? — Ascaris lumbricoides

21. The disease caused by Wuchereria bancrofti is primarily characterized by: — Blockage of the lymphatic system

22. The life cycle of Ascaris lumbricoides involves a larval migration through the host's body. Which organs are typically involved in this migration before the worms reach the intestine? — Lungs and liver

23. The phenomenon of nocturnal periodicity in microfilariae of Wuchereria bancrofti is thought to be related to: — Host body temperature and oxygen levels

24. What is the vector for Wuchereria bancrofti? — Mosquito

25. What is the primary mode of transmission for Ascaris lumbricoides? — Ingestion of contaminated water

26. The adult Fasciola hepatica resides in which organ of the definitive host (sheep or cattle)? — Liver and bile ducts

27. The cercaria of Fasciola hepatica possesses a tail and is motile. What is its fate after leaving the snail? — It encysts on vegetation to form a metacercaria.

28. In Fasciola hepatica, the miracidium is the larval stage that emerges from the egg and infects the snail. What is its primary characteristic? — It possesses cilia for movement and an apical gland

29. Which of the following statements about the life cycle of Taenia saginata (beef tapeworm) is true? — Humans become infected by ingesting undercooked beef containing cysticerci.

30. The characteristic symptom of chronic Wuchereria bancrofti infection is: — Elephantiasis

31. What is the characteristic shape of the adult Taenia solium (pork tapeworm)? — Segmented and ribbon-like

32. What is the primary target organ for the adult Ascaris lumbricoides? — Small intestine

33. Wuchereria bancrofti is a filarial worm responsible for lymphatic filariasis. In which part of the lymphatic system does the adult worm primarily reside? — Lymphatic vessels of the limbs and groin

34. The cuticle of Ascaris lumbricoides is shed and replaced multiple times during its life cycle. This process is called: — Ecdysis (molting)

35. The infective larvae of Wuchereria bancrofti are transmitted by mosquitoes. What is the stage of the larva that infects humans? — Third-stage larva (filariform larva)

36. Which larval stage of Fasciola hepatica develops within the snail and reproduces asexually? — Sporocyst and Redia

37. The term 'proglottid' refers to a segment of which type of helminth? — Cestode

38. The uterus in a gravid proglottid of Taenia species primarily contains: — Oncospheres

39. Which of the following is the definitive host for Taenia solium? — Human

40. The presence of a genital pore is characteristic of which part of the Taenia tapeworm? — Mature and gravid proglottid

41. The gravid proglottids of Taenia species contain: — Developing oncospheres within eggs

42. Which stage of Fasciola hepatica is infective to the intermediate host, the snail? — Cercaria

43. The scolex of Taenia solium is equipped with structures for attachment. What are these structures? — Hooks and suckers

44. Which of the following helminths is a trematode (fluke)? — Fasciola hepatica

45. What is the oncosphere in the life cycle of Taenia species? — The larval stage within the egg, which contains hooks

46. The lymphatic system is the primary site for adult Wuchereria bancrofti. However, larval stages (microfilariae) can be found in: — The blood, with nocturnal periodicity

47. The microfilariae of Wuchereria bancrofti exhibit periodicity. What does this mean? — They are only present during the night

48. The proglottids are characteristic features of which group of helminths? — Cestodes

49. Pulmonary symptoms, such as cough and wheezing, can occur during which phase of Ascaris lumbricoides infection? — During the larval migration through the lungs

Structure and life history of helminth parasites – Fasciola, Taenia, Wuchereria, Ascaris - One Line Questions