Nematodes (Roundworms)

Question 1

Cylindrical, unsegmented, bilaterally symmetrical bodies

Answer 1

Nematodes / Round worms

Question 2

Produces unembryonated eggs (external embryonation)

Answer 2

Oviparous

Question 3

Produces embryonated eggs (internal embryonation / embryonation in the uterus)

Answer 3

Ovo-viviparous

Question 4

Do not lay eggs but instead produce larvae

Answer 4

Viviparous

Question 5

Sensory organ: Cephalic chemoreceptors present in all nematodes

Answer 5

Amphids

Question 6

Sensory organ: Caudal chemoreceptors; not present in Trichuris, Capillaria, Trichinella spp.

Answer 6

Phasmids

Question 7

What are the round worms that inhabits in the small intestine?

Answer 7

(CASH) C. philippinensis, A, lumbricoides, S. stercoralis, Hookworms

Question 8

What are the round worms that inhabits in the large intestine?

Answer 8

E. vermicularis, T. trichura

Question 9

What are the round worms that inhabits in the extraintestinal?

Answer 9

T. spiralis, D. medinensis, Filariae, Agents of larva migrants

Question 10

What intestinal nematode is the most common cause of helminth infection in the world

Answer 10

Enterobius vermicularis

Question 11

What intestinal nematode is the third most common roundworm of humans?

Answer 11

Trichuris trichiura

Question 12

What is the largest intestinal nematode?

Answer 12

Ascaris lumbricoides

Question 13

What species are part of the “Unholy 3”?

Answer 13

T. trichiura, A. lumbricoides, Hookworms

Question 14

Intestinal nematode wherein the female produces two types of eggs?

Answer 14

Capillaria philippinensis

Question 15

Intestinal nematode wherein the females are parthenogenetic?

Answer 15

Strongyloides stercoralis

Question 16

What is the common name of E. vermicularis?

Answer 16

Pinworm

Question 17

What species has this common name: Whipworm

Answer 17

T. trichiura

Question 18

What is the common name of A. lumbricoides

Answer 18

Giant intestinal round worm

Question 19

What species has this common name: New world hookworm

Answer 19

N. americanus

Question 20

What is the common name of A. duodenale?

Answer 20

Old world hookworm

Question 21

What species has this common name: Threadworm

Answer 21

S. stercoralis

Question 22

What is the common name of Capillaria philippinensis?

Answer 22

Pudore worm

Question 23

What is the diagnostic stage of E. vermicularis?

Answer 23

Embryonated eggs

Question 24

What species has a diagnostic stage of unembryonated eggs?

Answer 24

T. trichiura, A. lumbricoides, N. americanus, A. duodenale, C. philippinensis

Question 25

What is the diagnostic stage of S. stercoralis?

Answer 25

Rhabditiform larvae

Question 26

What is the MOT of E. vermicularis, T. trichiura, and A. lumbricoides?

Answer 26

Ingestion of embryonated eggs

Question 27

What is the MOT of N. americanus, A. duodenale, and S. stercoralis?

Answer 27

Skin penetration by Filariform larvae

Question 28

What is the MOT of C. philippinensis?

Answer 28

Ingestion of infected larvae from fish

Question 29

Morphology of Eggs: Colorless, D-shaped / lopsided / planoconvex

Answer 29

E. vermicularis

Question 30

Morphology of Eggs: Barrel, football, lemon, or Japanese lantern-shape with rounded bipolar plugs Bile stained

Answer 30

T. trichiura

Question 31

Morphology of Eggs: Round or ovoidal Thick shell with 3 layers

Answer 31

Fertilized A. lumbricoides

Question 32

Morphology of Eggs: Elongated Shell often very thin and may be decorticated

Answer 32

Unfertilized A. lumbricoides

Question 33

Morphology of Eggs: Oval or ellipsoidal Thin colorless shell with grayish cells

Answer 33

Hookworms

Question 34

Morphology of Eggs: Similar to hookworms but usually embryonated

Answer 34

S. stercoralis

Question 35

Morphology of Eggs: Peanut-shaped With flattened bipolar plugs and striated shell

Answer 35

C. philippinensis

Question 36

Morphological Feature of Hookworm: Semilunar Cutting plates

Answer 36

N. americanus

Question 37

Morphological Feature of Hookworm: 2 pairs of teeth

Answer 37

A. duodenale

Question 38

Morphological Feature of Hookworm: Fused / barbed copulatory spicules Dorsal ray tips: Bidigitate

Answer 38

N. americanus

Question 39

Morphological Feature of Hookworm: Not fused or barbed spicules Dorsal ray tips: Tridigitate

Answer 39

A. duodenale

Question 40

What is the stage of the Hookworm and S. stercoralis is the feeding stage and it is non-fective

Answer 40

Rhabditiform larva

Question 41

What species has a long buccal cavity in the rhabditiform larva?

Answer 41

Hook worm

Question 42

What species has a large genital primordium in the rhabditiform larva?

Answer 42

S. stercoralis

Question 43

What species has a long esophagus in the filariform larva?

Answer 43

S. stercoralis

Question 44

What species has a sheath in the filariform larva?

Answer 44

Hookworm

Question 45

What species has a notched or forked tail end in the filariform larva?

Answer 45

S. stercoralis