LESSON 4 - INTESTINAL NEMATODES

Question 1

What specific feature of the hookworm buccal capsule helps identify Ancylostoma duodenale?

Answer 1

Presence of two pairs of teeth (four total).

Question 2

The __________ layer of Ascaris eggs provides protection against desiccation.

Answer 2

Chitin

Question 3

Identify the parasite with a peanut-shaped egg and flattened bipolar plugs.

Answer 3

Capillaria philippinensis

Question 4

[Scenario] A farmer consumes vegetables fertilized with human waste and ingests an egg that hatches inside the intestine. What parasitic reproduction mode is this?

Answer 4

Oviviparous

Question 5

The _________ layer of Ascaris eggs provides insulation.

Answer 5

Lipoidal

Question 6

Which parasite has rhabditiform larvae with short buccal capsules and large genital primordium?

Answer 6

Strongyloides stercoralis

Question 7

Eggs of _________ are rarely observed in diagnostics.

Answer 7

Strongyloides stercoralis

Question 8

Why is the lipoidal layer important in the development of Ascaris eggs?

Answer 8

It provides insulation, maintaining warmth for embryonic development.

Question 9

Which parasite’s anterior part is embedded in the intestinal mucosa, and why?

Answer 9

Trichuris trichiura; the thin whip-like portion embeds to absorb nutrients.

Question 10

Name the parasite known for laying eggs with flattened bipolar plugs and striated shells.

Answer 10

Capillaria philippinensis

Question 11

Strongyloides stercoralis has a __________ tail in its filariform larva stage.

Answer 11

Notched

Question 12

[Scenario] A soldier from Vietnam reports symptoms consistent with threadworm infection. What nematode is historically linked to this population?

Answer 12

Strongyloides stercoralis

Question 13

This parasite lays D-shaped eggs with one flat and one curved side. What is it?

Answer 13

Enterobius vermicularis

Question 14

What is the anatomical function of the copulatory bursa in male hookworms?

Answer 14

It acts as a reproductive organ for penetrating the female during mating.

Question 15

Identify the hookworm species with bidigitate spicules and deep bursal clefts.

Answer 15

Necator americanus

Question 16

How can you differentiate male and female Ascaris under the microscope?

Answer 16

By examining the tail: curved in males, pointed in females

Question 17

The oviparous mode of reproduction involves egg hatching __________ the host.

Answer 17

outside

Question 18

[Scenario] In a tropical area, a child walks barefoot and later develops anemia. Stool shows hyaline eggs with blastomeres. What parasite is suspected?

Answer 18

Hookworm

Question 19

Identify the parasite with trilobate lips on its anterior end.

Answer 19

Ascaris lumbricoides

Question 20

What function does the cephalic alae serve in Enterobius vermicularis?

Answer 20

It helps in identifying the worm; it’s a cuticular alar expansion

Question 21

[Scenario] A child in a daycare facility experiences perianal itching at night. What is the most probable parasite?

Answer 21

Enterobius vermicularis

Question 22

Trichuris trichiura is also called the __________ due to its shape.

Answer 22

Whipworm

Question 23

[Scenario] A stool sample reveals Necator americanus. What parasite is likely involved?

Answer 23

Necator americanus

Question 24

[Scenario] A patient presents with malnutrition and a stool sample reveals a larva with a notched tail. What is the likely parasite?

Answer 24

Strongyloides stercoralis

Question 25

The anterior of Enterobius vermicularis has a __________ structure used for identification.

Answer 25

Fan-like (cephalic alae)

Question 26

Which parasite is also known as the 'Mystery Worm' and why?

Answer 26

Capillaria philippinensis; because it was initially unknown as the cause of illness

Question 27

The larval stage of hookworms that is commonly seen in stool is the __________ form.

Answer 27

Rhabditiform

Question 28

Which larval stage of hookworm is infective to humans?

Answer 28

Filariform larva

Question 29

Name the parasite that has a whip-like appearance with a thin anterior portion embedded in the mucosa.

Answer 29

Trichuris trichiura

Question 30

Capillaria philippinensis embryonates in __________ environments.

Answer 30

Freshwater and brackish water

Question 31

What nematode has a guitar-shaped egg that embryonates in freshwater?

Answer 31

Capillaria philippinensis

Question 32

Why are hookworm eggs difficult to differentiate microscopically?

Answer 32

Because their morphology is similar, and only size differentiates them.

Question 33

___________ has cutting plates instead of teeth in its buccal capsule.

Answer 33

Necator americanus

Question 34

[Scenario] A stool sample reveals Capillaria philippinensis; because it was initially unknown as the cause of illness. What parasite is likely involved?

Answer 34

Capillaria philippinensis; because it was initially unknown as the cause of illness

Question 35

Which parasite produces eggs that resemble a Japanese lantern?

Answer 35

Trichuris trichiura

Question 36

What unique feature of Strongyloides stercoralis allows it to reproduce without a male?

Answer 36

Parthenogenesis

Question 37

Which parasite has a pointed tail in females and a curved tail in males?

Answer 37

Ascaris lumbricoides

Question 38

What parasitic classification is given to a worm that lays eggs which hatch inside the host before leaving?

Answer 38

Oviviparous

Question 39

The _____ layer of an Ascaris egg is responsible for preventing desiccation.

Answer 39

Chitin

Question 40

What specific morphological feature distinguishes male Ascaris from female Ascaris when viewed under a microscope?

Answer 40

Curved tail

Question 41

Which layer of Ascaris egg is considered the outermost and responsible for cortication?

Answer 41

Mamillated Albuminous Layer

Question 42

A lab technician observes an intestinal egg with a striated wall, flattened bipolar plugs, and finds it in brackish water. What parasite is most likely being observed?

Answer 42

Capillaria philippinensis

Question 43

Which larval stage of hookworms is infective and capable of penetrating the skin?

Answer 43

Filariform

Question 44

The anterior portion of Trichuris trichiura is thin and contains the _____ and esophagus.

Answer 44

Mouth

Question 45

What term is used to describe a parasite that gives birth to live larvae without laying eggs?

Answer 45

Viviparous

Question 46

A stool sample reveals rhabditiform larvae with short buccal capsules and prominent genital primordium. What parasite is indicated?

Answer 46

Strongyloides stercoralis

Question 47

Which nematode has eggs shaped like a Japanese lantern and contains bipolar plugs?

Answer 47

Trichuris trichiura

Question 48

What parasitic classification is given to a worm that lays eggs which hatch inside the host before leaving? [VAR11]

Answer 48

Oviviparous

Question 49

The _____ layer of an Ascaris egg is responsible for preventing desiccation. [VAR12]

Answer 49

Chitin

Question 50

What specific morphological feature distinguishes male Ascaris from female Ascaris when viewed under a microscope? [VAR13]

Answer 50

Curved tail

Question 51

Which layer of Ascaris egg is considered the outermost and responsible for cortication? [VAR14]

Answer 51

Mamillated Albuminous Layer

Question 52

A lab technician observes an intestinal egg with a striated wall, flattened bipolar plugs, and finds it in brackish water. What parasite is most likely being observed? [VAR15]

Answer 52

Capillaria philippinensis

Question 53

Which larval stage of hookworms is infective and capable of penetrating the skin? [VAR16]

Answer 53

Filariform

Question 54

The anterior portion of Trichuris trichiura is thin and contains the _____ and esophagus. [VAR17]

Answer 54

Mouth

Question 55

What term is used to describe a parasite that gives birth to live larvae without laying eggs? [VAR18]

Answer 55

Viviparous

Question 56

A stool sample reveals rhabditiform larvae with short buccal capsules and prominent genital primordium. What parasite is indicated? [VAR19]

Answer 56

Strongyloides stercoralis

Question 57

Which nematode has eggs shaped like a Japanese lantern and contains bipolar plugs? [VAR20]

Answer 57

Trichuris trichiura

Question 58

What parasitic classification is given to a worm that lays eggs which hatch inside the host before leaving? [VAR21]

Answer 58

Oviviparous

Question 59

The _____ layer of an Ascaris egg is responsible for preventing desiccation. [VAR22]

Answer 59

Chitin

Question 60

What specific morphological feature distinguishes male Ascaris from female Ascaris when viewed under a microscope? [VAR23]

Answer 60

Curved tail

Question 61

Which layer of Ascaris egg is considered the outermost and responsible for cortication? [VAR24]

Answer 61

Mamillated Albuminous Layer

Question 62

A lab technician observes an intestinal egg with a striated wall, flattened bipolar plugs, and finds it in brackish water. What parasite is most likely being observed? [VAR25]

Answer 62

Capillaria philippinensis

Question 63

Which larval stage of hookworms is infective and capable of penetrating the skin? [VAR26]

Answer 63

Filariform

Question 64

The anterior portion of Trichuris trichiura is thin and contains the _____ and esophagus. [VAR27]

Answer 64

Mouth

Question 65

What term is used to describe a parasite that gives birth to live larvae without laying eggs? [VAR28]

Answer 65

Viviparous

Question 66

A stool sample reveals rhabditiform larvae with short buccal capsules and prominent genital primordium. What parasite is indicated? [VAR29]

Answer 66

Strongyloides stercoralis

Question 67

Which nematode has eggs shaped like a Japanese lantern and contains bipolar plugs? [VAR30]

Answer 67

Trichuris trichiura

Question 68

What parasitic classification is given to a worm that lays eggs which hatch inside the host before leaving? [VAR31]

Answer 68

Oviviparous

Question 69

The _____ layer of an Ascaris egg is responsible for preventing desiccation. [VAR32]

Answer 69

Chitin

Question 70

What specific morphological feature distinguishes male Ascaris from female Ascaris when viewed under a microscope? [VAR33]

Answer 70

Curved tail

Question 71

Which layer of Ascaris egg is considered the outermost and responsible for cortication? [VAR34]

Answer 71

Mamillated Albuminous Layer

Question 72

A lab technician observes an intestinal egg with a striated wall, flattened bipolar plugs, and finds it in brackish water. What parasite is most likely being observed? [VAR35]

Answer 72

Capillaria philippinensis

Question 73

Which larval stage of hookworms is infective and capable of penetrating the skin? [VAR36]

Answer 73

Filariform

Question 74

The anterior portion of Trichuris trichiura is thin and contains the _____ and esophagus. [VAR37]

Answer 74

Mouth

Question 75

What term is used to describe a parasite that gives birth to live larvae without laying eggs? [VAR38]

Answer 75

Viviparous

Question 76

A stool sample reveals rhabditiform larvae with short buccal capsules and prominent genital primordium. What parasite is indicated? [VAR39]

Answer 76

Strongyloides stercoralis

Question 77

Which nematode has eggs shaped like a Japanese lantern and contains bipolar plugs? [VAR40]

Answer 77

Trichuris trichiura

Question 78

What parasitic classification is given to a worm that lays eggs which hatch inside the host before leaving? [VAR41]

Answer 78

Oviviparous

Question 79

The _____ layer of an Ascaris egg is responsible for preventing desiccation. [VAR42]

Answer 79

Chitin

Question 80

What specific morphological feature distinguishes male Ascaris from female Ascaris when viewed under a microscope? [VAR43]

Answer 80

Curved tail

Question 81

Which layer of Ascaris egg is considered the outermost and responsible for cortication? [VAR44]

Answer 81

Mamillated Albuminous Layer

Question 82

A lab technician observes an intestinal egg with a striated wall, flattened bipolar plugs, and finds it in brackish water. What parasite is most likely being observed? [VAR45]

Answer 82

Capillaria philippinensis

Question 83

Which larval stage of hookworms is infective and capable of penetrating the skin? [VAR46]

Answer 83

Filariform

Question 84

The anterior portion of Trichuris trichiura is thin and contains the _____ and esophagus. [VAR47]

Answer 84

Mouth

Question 85

What term is used to describe a parasite that gives birth to live larvae without laying eggs? [VAR48]

Answer 85

Viviparous

Question 86

A stool sample reveals rhabditiform larvae with short buccal capsules and prominent genital primordium. What parasite is indicated? [VAR49]

Answer 86

Strongyloides stercoralis

Question 87

Which nematode has eggs shaped like a Japanese lantern and contains bipolar plugs? [VAR50]

Answer 87

Trichuris trichiura

Question 88

What parasitic classification is given to a worm that lays eggs which hatch inside the host before leaving? [VAR51]

Answer 88

Oviviparous

Question 89

The _____ layer of an Ascaris egg is responsible for preventing desiccation. [VAR52]

Answer 89

Chitin

Question 90

What specific morphological feature distinguishes male Ascaris from female Ascaris when viewed under a microscope? [VAR53]

Answer 90

Curved tail

Question 91

Which layer of Ascaris egg is considered the outermost and responsible for cortication? [VAR54]

Answer 91

Mamillated Albuminous Layer

Question 92

A lab technician observes an intestinal egg with a striated wall, flattened bipolar plugs, and finds it in brackish water. What parasite is most likely being observed? [VAR55]

Answer 92

Capillaria philippinensis

Question 93

Which larval stage of hookworms is infective and capable of penetrating the skin? [VAR56]

Answer 93

Filariform

Question 94

The anterior portion of Trichuris trichiura is thin and contains the _____ and esophagus. [VAR57]

Answer 94

Mouth

Question 95

What term is used to describe a parasite that gives birth to live larvae without laying eggs? [VAR58]

Answer 95

Viviparous

Question 96

A stool sample reveals rhabditiform larvae with short buccal capsules and prominent genital primordium. What parasite is indicated? [VAR59]

Answer 96

Strongyloides stercoralis

Question 97

Which nematode has eggs shaped like a Japanese lantern and contains bipolar plugs? [VAR60]

Answer 97

Trichuris trichiura