Cestodes (generalities + characs)

Question 1

The cestodes, or tapeworms, constitute the class ____ of the phylum ____.

Answer 1

Cestoda; Platyhelminthes

Question 2

All adult tapeworms have a white body and a ____-like appearance.

eong kalaban ng Goldilocks!

Answer 2

ribbon-like

Question 3

All cestodes are hermaphroditic, otherwise known as ____.

Answer 3

monoecious

Question 4

What do you call the attachment organ in the anterior portion of a tapeworm?

Answer 4

scolex

Question 5

What do you call the portion immediately posterior to the scolex where new segments continuously grow?

Answer 5

neck

Question 6

What do you call the segments of a tapeworm that grows from the neck?

Answer 6

proglottids

also known as strobila

Question 7

The new segments are referred to as ____ because they do not yet contain fully developed internal structures.

Answer 7

immature

Question 8

The ____ segments are larger and are found near the middle of the chain, and may contain set/s of reproductive organs.

Answer 8

mature

Question 9

The terminal portion of the strobila contains the ____ segments, usually filled with eggs.

Answer 9

gravid

or ripe

Question 10

In the adult worm of cestodes, the eggs are enclosed in the ____, a structure that varies in shape and size and serves as an important diagnostic feature.

Answer 10

uterus

Question 11

Terminal proglottids may become detached in the intestine and pass out with the stool in a process called ____.

Answer 11

apolysis

Question 12

All tapeworms inhabit the ____, where they live attached to the mucosa.

Answer 12

small intestine

Question 13

Tapeworms do not have a digestive system. Instead, nutrients are absorbed from the host’s intestine through the ____.

Answer 13

tegument

Question 14

The tapeworms are classified into two orders, order ____ and order ____.

vid on orders

Answer 14

• Order Pseudophyllidea
• Order Cyclophyllidea

False & True tapeworm

Question 15

All cestodes have four muscular, cuplike suckers on the scolex except the tapeworms from what order?

Answer 15

order Pseudophyllidea

Question 16

Cestodes under the order Pseudophyllidea possess a scolex bearing grooves called ____ instead of suckers.

Answer 16

bothria

Question 17

The scolex may have an elongate and protrusible structure called ____ that is situated in the center of the scolex.

Answer 17

rostellum

Question 18

Depending on whether hooks are present or not, the crown of scolex may be ____ or ____.

Answer 18

armed or unarmed

Question 19

In general, cestodes’ extraintestinal infection with the ____ forms is a much more serious matter than infection with the adult worm.

Answer 19

larval

Question 20

What are the three shapes (kinds) a scolex may have?

Answer 20

• Quadrate
• Globular
• Spoon-like

Question 21

Identify the order of tapeworm being described

Dibothriocephalus latus is a member

Answer 21

Order Pseudophyllidea

Question 22

Identify the order of tapeworm being described

Scolex is/has:
- Spoonlike, almond-shaped, spatulate
- 2 slitlike grooves called bothria
- No rostellum and no hooks

Answer 22

Order Pseudophyllidea

Question 23

Identify the order of tapeworm being described

Scolex is/may:

• Quadrate
• possess rostellum
• possess 4 cuplike suckers

Answer 23

Order Cyclophyllidea

Question 24

Identify the order of tapeworm being described

Its strobila is Anapolytic

Answer 24

Order Pseudophyllidea

Question 25

# Identify the order of tapeworm being described Its strobila is **Apolytic**

Answer 25

Order Cyclophyllidea

Question 26

# Identify the order of tapeworm being described The gravid proglottid has: - **all** reproductive organs still present - a **rosette uterus**

Answer 26

Order Pseudophyllidea

Question 27

# Identify the order of tapeworm being described The gravid proglottid has: - **degenerate** reproductive organs - **only the uterus** and its lateral branches _are seen_

Answer 27

Order Cyclophyllidea

Question 28

# Identify the order of tapeworm being described The **uterine pore** is _present_ and _located on the median ventral surface_

Answer 28

Order Pseudophyllidea

Question 29

# Identify the order of tapeworm being described The **uterine pore** is _absent_

Answer 29

Order Cyclophyllidea

Question 30

# Identify the order of tapeworm being described The ova may be described as: - Oval - Operculated - Unembryonated

Answer 30

Order Pseudophyllidea

Question 31

# Identify the order of tapeworm being described The ova may be described as: - Spherical - Non-operculated - Embryonated

Answer 31

Order Cyclophyllidea

Question 32

# Identify the order of tapeworm being described The larval stages present are: - Coracidium - Procercoid - Plerocercoid

Answer 32

Order Pseudophyllidea

Question 33

# Identify the order of tapeworm being described The larval stages present are: - Cysticercus - Cysticercoid - Hydatid cyst

Answer 33

Order Cyclophyllidea

Question 34

# Identify the order of tapeworm being described **Has 2 intermediate hosts** namely: - crustaceans/copepods - freshwater fishes

Answer 34

Order Pseudophyllidea

Question 35

# Identify the order of tapeworm being described **Has 1 intermediate host**: lower animal forms, man ## Footnote some do not require intermediate hosts

Answer 35

Order Cyclophyllidea

Question 36

What is the former name of *Dibothriocephalus latus?*

Answer 36

*Diphyllobothrium latum*

Question 37

Although infection of *Dibothriocephalus latus* is relatively harmless, it may **produce a condition** called ____ _due to the selective absorption of vitamin B₁₂_ from the intestines.

Answer 37

pernicious anemia ## Footnote which leads to erythropoiesis impairment then macrocyte production

Question 38

What do you call the **embryo** that the _membranes_ of a *tapeworm egg protect*?

Answer 38

oncosphere | usually described as **hexacanth embryo** ## Footnote hexacanth = hexa = 6 small hooks (hooklets) r present (3 pairs)

Question 39

largest tapeworm of man?

Answer 39

*Dibothriocephalus latus*

Question 40

Some cestode species utilize **humans only as definitive hosts**, _growing to adulthood in the intestine_ *after the ingestion of infective larva*. What are these spp.?

Answer 40

- *Dibothriocephalus latus* - *Taenia saginata* - *Hymenolepis diminuta*

Question 41

Some cestode species **utilize humans** as _both the definitive or intermediate hosts_. What are these spp.?

Answer 41

- *Taenia solium* - *Hymenolepis nana*

Question 42

Other cestode spp, such as ____, utilize **humans as _one of their possible intermediate host_** but _never as the definitive host_.

Answer 42

*Echinococcus*

Question 43

Which of the cestodes consider man **as an accidental host**?

Answer 43

- *Dipylidium caninum* - *Hymenolepis* spp. - *Echinococcus* spp.

Question 44

Which of the cestodes have their **gravid segments** _wider than longer_?

Answer 44

*Dibothriocephalus latus*

Question 45

Which of the cestodes have their **mature segments** _wider than longer_?

Answer 45

- *Dibothriocephalus latus* - *Taenia solium* - *Taenia saginata*

Question 46

Which of the cestodes have **all segments** _wider than longer_?

Answer 46

- *Hymenolepis nana* - *Hymenolepis diminuta*

Question 47

Which of the cestodes have its **mature and gravid proglottid** _longer than wide_?

Answer 47

*Dipylidium caninum*

Question 48

# True or False The **embryonated egg** of beef tapeworm is the _infective stage_ to humans

Answer 48

False | IS is larva: Cysticercus bovis

Question 49

# True or False The _eggs_ of *Taenia solium* and *Taenia saginata* is **indistinguishable** from each other.

Answer 49

True

Question 50

# True or False *Taenia solium* adult is **longer than** *Dibothriocephalus latus* adult

Answer 50

False | longest tapeworm si *D. latus*

Question 51

What is the **infective stage** of _rat tapeworm_?

Answer 51

Cysticercoid larva | rat tapeworm = *Hymenolepis diminuta*

Question 52

What is the **scientific name** of the *only tapeworm* that _may or may not require an intermediate host_?

Answer 52

*Hymenolepis nana*

Question 53

# True or False *Taenia solium* egg is the infective stage to humans?

Answer 53

True | but **book said na egg is an infective stage** ## Footnote but ma'am said na false daw (but buk)

Question 54

What do you call the **intradermal test** to _diagnose Hydatid disease_?

Answer 54

Casoni Intradermal Test

Question 55

**Polar filaments** is _diagnostic to what tapeworm_?

Answer 55

*Hymenolepis nana*

Question 56

Presence of **two genital pores** in _a proglottid_ is a diagnostic feature of what tapeworm?

Answer 56

*Dipylidium caninum*

Question 57

What is the scientific name of the **only tapeworm with operculated eggs**?

Answer 57

*Dibothriocephalus latus*

Question 58

# True or False Hydatid disease is seen in *Hymenolepis diminuta*

Answer 58

False