TRB PG Assistant - Structure and life history of helminth parasites – Fasciola, Taenia, Wuchereria, Ascaris Online Test (MCQ Quiz)

1. In Fasciola hepatica, the ventral sucker is also known as the acetabulum. What is its primary function?

A) Absorption of nutrients from the host B) Attachment to the host's tissues C) Reproduction and gamete release D) Excretion of waste products

2. Which stage of Fasciola hepatica is infective to the intermediate host, the snail?

A) Sporocyst B) Redia C) Cercaria D) Metacercaria

3. The adult Fasciola hepatica resides in which organ of the definitive host (sheep or cattle)?

A) Intestine B) Liver and bile ducts C) Lungs D) Blood vessels

4. What is the characteristic shape of the adult Taenia solium (pork tapeworm)?

A) Leaf-like and dorsoventrally flattened B) Elongated and cylindrical C) Segmented and ribbon-like D) Globular and unsegmented

5. The scolex of Taenia solium is equipped with structures for attachment. What are these structures?

A) Suckers only B) Hooks and suckers C) Cilia and adhesive glands D) Antennae and mandibles

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

A) Cercaria B) Miracidium C) Cysticercus D) Onchosphere

7. Which of the following is the definitive host for Taenia solium?

A) Pig B) Cow C) Human D) Dog

8. Wuchereria bancrofti is a filarial worm responsible for lymphatic filariasis. In which part of the lymphatic system does the adult worm primarily reside?

A) Lymph nodes B) Lymphatic vessels of the limbs and groin C) Thoracic duct D) Spleen

9. What is the vector for Wuchereria bancrofti?

A) Housefly B) Mosquito C) Tick D) Sandfly

10. The microfilariae of Wuchereria bancrofti exhibit periodicity. What does this mean?

A) They are only present during the day B) They are only present during the night C) Their numbers fluctuate randomly D) They are continuously present in equal numbers

11. The characteristic symptom of chronic Wuchereria bancrofti infection is:

A) Jaundice B) Elephantiasis C) Anemia D) Hepatitis

12. Ascaris lumbricoides is a large intestinal roundworm. What is the infective stage for humans?

A) Adult worm B) Egg with developed larva (larvated egg) C) Egg without larva (unembryonated egg) D) Larval stage in soil

13. 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?

A) Heart and kidneys B) Lungs and liver C) Brain and spinal cord D) Spleen and pancreas

14. What is the primary mode of transmission for Ascaris lumbricoides?

A) Ingestion of contaminated water B) Inhalation of airborne eggs C) Bite of an infected insect D) Consumption of undercooked meat

15. The adult Ascaris lumbricoides lives in the:

A) Bile ducts B) Small intestine C) Large intestine D) Stomach

16. Which of the following helminths is a trematode (fluke)?

A) Taenia solium B) Wuchereria bancrofti C) Ascaris lumbricoides D) Fasciola hepatica

17. The proglottids are characteristic features of which group of helminths?

A) Trematodes B) Cestodes C) Nematodes D) Acanthocephalans

18. Which helminth parasite has a life cycle that typically involves two intermediate hosts?

A) Ascaris lumbricoides B) Taenia solium C) Fasciola hepatica D) Wuchereria bancrofti

19. The infective larvae of Wuchereria bancrofti are transmitted by mosquitoes. What is the stage of the larva that infects humans?

A) Microfilaria B) Third-stage larva (filariform larva) C) First-stage larva (rhabditiform larva) D) Second-stage larva

20. What is the oncosphere in the life cycle of Taenia species?

A) The adult tapeworm B) The larval stage in the intermediate host's muscle C) The larval stage within the egg, which contains hooks D) The infective stage for the definitive host

21. The term 'cysticercosis' refers to an infection caused by which helminth parasite?

A) Fasciola hepatica B) Wuchereria bancrofti C) Taenia solium D) Ascaris lumbricoides

22. In Fasciola hepatica, the miracidium is the larval stage that emerges from the egg and infects the snail. What is its primary characteristic?

A) It is non-motile and spherical B) It possesses cilia for movement and an apical gland C) It develops into a cercaria directly D) It is the infective stage for the definitive host

23. The reproductive system of Fasciola hepatica is characterized by:

A) A single set of male and female organs B) Separate male and female individuals C) Hermaphroditism, with both male and female organs in each individual D) Asexual reproduction only

24. Which of the following statements about the life cycle of Taenia saginata (beef tapeworm) is true?

A) It uses pigs as intermediate hosts. B) Humans become infected by ingesting undercooked beef containing cysticerci. C) The adult worm resides in the lungs. D) It is transmitted by mosquito bites.

25. The gravid proglottids of Taenia species contain:

A) Sperm and ova B) Developing oncospheres within eggs C) The scolex D) Digestive enzymes

26. The filariform larva of Wuchereria bancrofti is characterized by:

A) A blunt tail and a short esophagus B) A sharp, pointed tail and a long esophagus C) The presence of a pharynx D) The ability to penetrate the skin directly

27. What is the primary target organ for the adult Ascaris lumbricoides?

A) Liver B) Lungs C) Small intestine D) Heart

28. Which of the following helminths is known for causing 'swimmer's itch' as a human health problem?

A) Fasciola hepatica B) Taenia solium C) Schistosoma species (not in this list, but a common fluke example) D) Wuchereria bancrofti

29. The cercaria of Fasciola hepatica possesses a tail and is motile. What is its fate after leaving the snail?

A) It directly infects the definitive host. B) It encysts on vegetation to form a metacercaria. C) It develops into a redia. D) It burrows into the snail's tissues.

30. The intestinal lumen of the definitive host is the habitat of which adult helminth?

A) Fasciola hepatica B) Taenia solium C) Wuchereria bancrofti D) All of the above

31. What is the primary way humans acquire infection with Ascaris lumbricoides?

A) Eating raw fish B) Drinking contaminated water with eggs C) Contact with infected soil D) Inhaling dust containing eggs

32. The lymphatic system is the primary site for adult Wuchereria bancrofti. However, larval stages (microfilariae) can be found in:

A) The liver and spleen B) The blood, with nocturnal periodicity C) The brain and spinal fluid D) The muscles and subcutaneous tissues

33. A characteristic feature of the Taenia scolex is the presence of:

A) A pharynx and esophagus B) Suckers and/or hooks for attachment C) A complex digestive system D) Cilia for locomotion

34. Which larval stage of Fasciola hepatica develops within the snail and reproduces asexually?

A) Miracidium B) Sporocyst and Redia C) Cercaria D) Metacercaria

35. The presence of a genital pore is characteristic of which part of the Taenia tapeworm?

A) Scolex B) Neck C) Immature proglottid D) Mature and gravid proglottid

36. Pulmonary symptoms, such as cough and wheezing, can occur during which phase of Ascaris lumbricoides infection?

A) When the adult worms are in the intestine B) During the larval migration through the lungs C) Immediately after ingesting the infective eggs D) During the egg-laying phase

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

A) Adult fluke B) Sporocyst C) Miracidium D) Cercaria

38. The term 'proglottid' refers to a segment of which type of helminth?

A) Nematode B) Trematode C) Cestode D) Acanthocephalan

39. The disease caused by Wuchereria bancrofti is primarily characterized by:

A) Gastrointestinal bleeding B) Blockage of the lymphatic system C) Damage to the nervous system D) Liver damage

40. Which of the following is NOT a typical feature of the adult Ascaris lumbricoides?

A) Cylindrical body shape B) Separate sexes (dioecious) C) Presence of suckers D) Complete digestive system

41. The development of microfilariae into infective larvae within the mosquito vector of Wuchereria bancrofti is an example of:

A) Direct development B) Indirect development with biological transmission C) Asexual reproduction D) Parthenogenesis

42. The uterus in a gravid proglottid of Taenia species primarily contains:

A) Ova B) Oncospheres C) Developing embryos D) Yolk cells

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

A) Cestoda B) Trematoda C) Turbellaria D) Monogenea

44. Which of the following helminths is known for its pseudocoelom (false body cavity)?

A) Fasciola hepatica B) Taenia solium C) Wuchereria bancrofti D) All of the above

45. The 'bladder worm' stage of Taenia species is also known as:

A) Cercaria B) Sporocyst C) Cysticercus D) Redia

46. The cuticle of Ascaris lumbricoides is shed and replaced multiple times during its life cycle. This process is called:

A) Metamorphosis B) Ecdysis (molting) C) Budding D) Regeneration

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

A) Fasciola hepatica B) Taenia solium C) Wuchereria bancrofti D) Ascaris lumbricoides

48. The terminal part of the digestive tract in Fasciola hepatica is:

A) Absent B) A simple anus C) A cloaca D) A coiled intestine

49. The phenomenon of nocturnal periodicity in microfilariae of Wuchereria bancrofti is thought to be related to:

A) Host body temperature and oxygen levels B) Lunar cycles C) The feeding habits of the mosquito vector D) The worm's own internal clock

Structure and life history of helminth parasites – Fasciola, Taenia, Wuchereria, Ascaris - Online Test

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