Quiz About Nematodes: Trivia Facts!

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| By Andrew Blanshard
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Andrew Blanshard
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Quiz About Nematodes: Trivia Facts! - Quiz

A quiz about nematodes: trivia facts! There over fifteen thousand identified worms in the phylum Nematoda. These worms occur as parasites in animals and plants or as free-living forms. They are actually the most common animals on earth and help in controlling pests in most cases. Most Nematodes are harmless to humans and animals. Do take this quiz and get to learn some more about them, their characteristics and importance to the ecosystem.


Questions and Answers
  • 1. 

    Which 4 worms have lifecycles involving migration to the lungs, being coughed up, swallowed, and down to the intestine?

    • A.

      Strongyloides, hookworm, ascaris and paragonimus.

    • B.

      Trichuris, hookworm, strongyloides and ascaris

    • C.

      Taenia, dicrocoelium, hookworm and enterobius.

    • D.

      Schistosoma, opisthorchis, ascaris and dipylidium.

    Correct Answer
    A. Strongyloides, hookworm, ascaris and paragonimus.
    Explanation
    The correct answer is Strongyloides, hookworm, ascaris, and paragonimus. These four worms have lifecycles that involve migration to the lungs, being coughed up, swallowed, and then reaching the intestine.

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  • 2. 

    Which larva can usually be found in fresh feces?

    • A.

      Taenia

    • B.

      Hookworm

    • C.

      Strongyloides

    • D.

      Enterobius

    Correct Answer
    C. Strongyloides
    Explanation
    Strongyloides is a type of parasitic nematode that commonly infests the intestines of humans and animals. The larvae of Strongyloides can be found in fresh feces. This parasite has a unique lifecycle where the larvae can infect the host through the skin, migrate to the lungs, and eventually reach the intestines where they mature into adults. The presence of Strongyloides larvae in fresh feces indicates an active infection and the potential for transmission to other individuals.

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  • 3. 

    How big is an infertile Ascaris egg?

    • A.

      55 mjcrons

    • B.

      120 - 140 microns

    • C.

      25 - 30 microns

    • D.

      85 - 90 microns

    Correct Answer
    D. 85 - 90 microns
    Explanation
    The correct answer is 85 - 90 microns. This means that an infertile Ascaris egg is between 85 and 90 microns in size.

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  • 4. 

    What are the main reservoirs of Strongyloides?

    • A.

      Bears

    • B.

      Dogs and primates

    • C.

      Rats and other rodents

    • D.

      Sheep and cattle

    Correct Answer
    B. Dogs and primates
    Explanation
    Strongyloides is a genus of parasitic worms that commonly infects dogs and primates. These worms live in the intestines of their hosts and can cause various health issues. While other animals like bears, rats, and sheep can also be infected with different species of Strongyloides, the main reservoirs for this particular genus are dogs and primates.

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  • 5. 

    How many times do the Strongyloides L1 larvae have to molt to enter the free-living cycle?

    • A.

      1

    • B.

      2

    • C.

      4

    • D.

      3

    Correct Answer
    C. 4
    Explanation
    The Strongyloides L1 larvae have to molt four times to enter the free-living cycle. Moulting is the process of shedding the old cuticle and forming a new one. Each molt allows the larvae to develop and grow, eventually reaching the infective L3 stage. Once they reach this stage, they can infect a host and continue their life cycle. Therefore, the correct answer is 4.

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  • 6. 

    Parthenogenesis occurs in which worm?

    • A.

      Ascaris

    • B.

      Enterobius

    • C.

      Hookworms

    • D.

      Strongyloides

    Correct Answer
    D. Strongyloides
    Explanation
    Parthenogenesis is a form of reproduction in which an organism can produce offspring without the need for fertilization. Among the given options, Strongyloides is the only worm that is known to exhibit parthenogenesis. This means that Strongyloides worms can reproduce without mating with a male worm, making them unique compared to the other worms listed. Ascaris, Enterobius, and Hookworms reproduce through sexual reproduction, requiring both male and female worms to mate. Therefore, the correct answer is Strongyloides.

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  • 7. 

    Ascaris is also called the whipworm?

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Ascaris is the common round worm, trichuriasis is the whip worm.

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  • 8. 

    Loeffler's syndrome occurs which nematode infection?

    • A.

      Trichuris.

    • B.

      Ascaris lumbricoides

    • C.

      Capillaria philippinensis

    • D.

      Enterobius

    Correct Answer
    B. Ascaris lumbricoides
    Explanation
    Loeffler's syndrome is a reaction to the worm in the lungs. It is treated with prednisolone.

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  • 9. 

    Ascaris can be treated with albendazole.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    True, and with mebendazole or pyrantel pamoate as well.

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  • 10. 

    Rectal prolapse can occur with which nematode infection?

    • A.

      Enterobius

    • B.

      Pinworm

    • C.

      Trichuris trichiura.

    • D.

      Capillaria philippinensis

    Correct Answer
    C. Trichuris trichiura.
    Explanation
    Rectal prolapse is a condition where the rectum protrudes out of the anus. Trichuris trichiura, also known as whipworm, is a nematode infection that can cause chronic inflammation of the large intestine. This chronic inflammation weakens the rectal muscles, making them more susceptible to prolapse. Enterobius, also known as pinworm, primarily affects the intestines but does not directly cause rectal prolapse. Capillaria philippinensis is a nematode that primarily affects the small intestine and does not cause rectal prolapse. Therefore, the correct answer is Trichuris trichiura.

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  • 11. 

    Nematodes are platyhelminths.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Cestodes and trematodes are platyhelminths.

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  • 12. 

    The eggs of Capillaria philippinensis are what size?

    • A.

      35 - 45 microns

    • B.

      60 - 70 microns

    • C.

      55 microns

    • D.

      120 - 140 microns

    Correct Answer
    A. 35 - 45 microns
    Explanation
    35- 45 with a striated shell and 2 polar plugs (non-protruding unlike trichuris).

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  • 13. 

    Trichuris trichiura are adults are found in the small intestine?

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    They mature to adults and oviposit in the caecum and ascending colon (both large intestine).

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  • 14. 

    Older dogs are a greater source of environmental Toxocara contamination then puppies.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    In puppies, the larvae migrate to the lungs, bronchial tree, and esophagus to become adults that oviposit, therefore passing eggs in their feces. In older dogs, the larvae encyst rather than becoming adults, so eggs are not passed as much in their feces.

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  • 15. 

    Trichinella spiralis has a high transmission rate in the UK?

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Trichinella is found worldwide, but there is little or no transmission in the UK. There are much higher rates in Eastern Europe, Asia, and Japan.

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  • 16. 

    Nurse-cell larval complexes are found in which worm's lifecycle?

    • A.

      Ancylostoma duodenale

    • B.

      Trichinella spiralis

    • C.

      Enterobius

    • D.

      Capillaria philippinensis

    Correct Answer
    B. Trichinella spiralis
    Explanation
    The female worms in the mucosa of the small intestine release larvae that migrate to striated muscle and encyst. The lifecycle is continued when this is eaten by other animals.

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  • 17. 

    Graham's test can be used for which infection diagnosis?

    • A.

      Toxocara

    • B.

      Ascaris

    • C.

      Trichinella

    • D.

      Enterobius

    Correct Answer
    D. Enterobius
    Explanation
    Graham's test is the sellotape method for pinworm eggs.

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  • 18. 

    Ground itch occurs with which worm infection.

    • A.

      Toxocara

    • B.

      Enterobius

    • C.

      Ascaris

    • D.

      Hookworm

    Correct Answer
    D. Hookworm
    Explanation
    Ground itch is a skin condition caused by the larvae of hookworms. These parasites can penetrate the skin, usually through bare feet, and cause an itchy rash and inflammation. The larvae migrate through the skin and eventually reach the intestines, where they mature into adult worms. Hookworm infection is commonly found in areas with poor sanitation and can be transmitted through contaminated soil or feces. Symptoms of hookworm infection may include anemia, abdominal pain, and diarrhea. Treatment typically involves medication to kill the worms and alleviate symptoms.

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  • 19. 

    Do L3 hookworm larvae have longer buccal cavities than Strongyloides?

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    L3 hookworm larvae have longer buccal cavities than Strongyloides. This means that the hookworm larvae have larger and more developed mouthparts compared to Strongyloides larvae. The length of the buccal cavity is an important characteristic that distinguishes different species of parasites.

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  • 20. 

    Cutaneous larval migrans occurs in Toxocara infection?

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    This occurs with hookworm when the larvae are migrating through the skin. It is caused by Ancylostoma caninum or braziliense and is treated with oral albendazole or topical thiabendazole. Visceral and ocular larval migrans occurs in Toxocara.

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  • 21. 

    Autoinfection can occur with Capillaria philippinensis.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Some eggs hatch in the intestine and re-invade the mucosa, whilst others are passed in the feces to be eaten by fish, which are then eaten by humans or birds (the definitive hosts).

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  • 22. 

    Ancylostoma duodenale has no teeth.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Anycylostoma does have teeth, necator americanus doesn't (it has plates).

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  • 23. 

    Trichuris eggs are passed into the soil embryonated.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    They are passed unembryonated and embryonated in the soil.

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  • 24. 

    Visceral and ocular larval migrans are caused by:

    • A.

      Enterobius

    • B.

      Loa loa

    • C.

      Toxocara

    • D.

      Strongyloides

    Correct Answer
    C. Toxocara
    Explanation
    Visceral and ocular larval migrans are caused by Toxocara. Toxocara is a parasitic roundworm that commonly infects dogs and cats. Humans can become infected by accidentally ingesting the eggs of the parasite, usually through contact with contaminated soil or objects. Once inside the body, the larvae migrate through various organs, including the liver, lungs, and eyes, causing inflammation and damage. This can lead to symptoms such as fever, abdominal pain, cough, and vision problems. Therefore, Toxocara is the correct answer for the cause of visceral and ocular larval migrans.

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  • 25. 

    Properly cooking fish is a control method for which worm?

    • A.

      Trichinella spiralis

    • B.

      Toxocara

    • C.

      Strongyloides

    • D.

      Capillaria philippinensis

    Correct Answer
    D. Capillaria philippinensis
    Explanation
    Capillaria philippinensis is transmitted by eating fish (brackish or freshwater). Birds are the definitive host.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 05, 2013
    Quiz Created by
    Andrew Blanshard

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