Platyhelminthes review quiz

Which of the following is NOT one of the four main classes of Platyhelminthes?

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

C) Nematoda

All members of Trematoda, Monogenea, and Cestoda are parasitic.

True

What two clades are contained within Protostomia?

Lophotrochozoa and Ecdysozoa

Lophotrochozoans are named for either a or a larval stage.

lophophore or trochophore

Which of the following correctly describes the Platyhelminthes body plan?

A) Triploblastic, segmented, coelomate
B) Diploblastic, acoelomate, radial symmetry
C) Triploblastic, acoelomate, bilateral symmetry
D) Triploblastic, coelomate, radial symmetry

C) Triploblastic, acoelomate, bilateral symmetry

What is the function of rhabdites in Turbellarians?

Form protective mucous sheath around the body

The tegument found in parasitic flatworms is ciliated and cellular.

False

The internal body space of a Platyhelminth is limited to the __.

gut cavity

Which class of Platyhelminthes lacks a digestive system entirely?

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

D) Cestoda

How do Turbellarians trap and consume their prey?

Trap prey in mucus and extend pharynx to ingest

Flatworms have a complete gut with a mouth and an anus.

False

Platyhelminthes use _ for excretion and osmoregulation.

protonephridia (flame cells)

How does the excretory system in Cestodes differ from that of Turbellarians?

Cestodes use longitudinal excretory canals

What type of nervous structure acts as the brain in advanced Platyhelminthes?

A) Nerve ring
B) Ganglion mass
C) Dorsal brain lobe
D) Nerve net

B) Ganglion mass

All flatworms have a simple nerve net with no central nervous system.

False

Are Platyhelminthes monoecious or dioecious? How do they usually reproduce?

Monoecious; most use cross-fertilization

Which class of Platyhelminthes uses multiple hosts and both sexual and asexual stages?

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

C) Trematoda

All Turbellarians are parasitic.

False

What regenerative ability is notable in Turbellarians?

Extreme regenerative capacity (can regrow body parts)

How do humans get infected with Clonorchis sinensis?

A) Drinking infected water
B) Eating raw or undercooked infected fish
C) Skin contact with cercaria-infested soil
D) Eating infected snails

B) Eating raw or undercooked infected fish

What is the role of the snail in the Clonorchis life cycle?

Intermediate host for larval development

Schistosoma differs from other flukes because it is ___.

dioecious

Schistosoma cercariae infect humans by being ingested in raw food.

False

What structure do Monogeneans use to attach to their host?

Opisthaptor

Monogeneans are usually endoparasitic.

False

What is the name of the structure used by tapeworms for attachment?

A) Proglottid
B) Scolex
C) Rhabdite
D) Tegument

B) Scolex

In Taenia, the larval stage called a ___ forms in muscle tissue.

cysticercus

How do humans get infected with Taenia?

By eating undercooked or raw infected beef or pork