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Acoelomate Animals
Test Description: Platyhelminthes, nemertea, and gnathostomulida
Instructions: Answer all questions to get your test result.
1) While most of the Platyhelminthes are free living or endoparasites, which one of the following taxa has an ectoparasitic life cycle?
A
monogenea
B
turbellaria
C
trematoda
D
cestoda
2) The members of the phylum Platyhelminthes are called flatworms because their bodies are flattened
A
laterally
B
anteriorly
C
posteriorly
D
dorsoventrally
3) The cells that secrete mucus in the epidermis of the Turbellaria are called
A
teguments
B
parenchyma
C
rhabdites
D
cuticle cells
4) The body of the parasisitc flatworms is covered in a syncytial layer called
A
a tegument
B
parenchyma
C
cuticle layer
D
a rhabdite
5) The cells that form a meshwork filling the spaces between the muscles and organs that develops from the mesoderm is called
A
a cuticle layer
B
parenchyma
C
a tegument
D
rhabdite
6) A cuticle is different from a tegument in that a cuticle is ______ while a tegument is _______.
A
alive, syncytial
B
deaad, alive
C
ciliated, dead
D
syncytial, ciliated
7) While the previous phyla have used intracellular digestion, within these three phyla extracellular digestion is the norm. Extracellular digestion means that
A
there is only one opening to the intestine
B
proteolytic enzymes are secreted into the gut
C
only parasitic feeding styles are used
D
proteolytic enzymes are found in the lysosomes
8) Another name for a protonephridium is a
A
syncytial layer
B
flame cell
C
microvillus
D
tegument
9) The protonephridia function in
A
waste disposal
B
respiration
C
digestion
D
osmoregulation
10) The nervous system of the flatworms has sensory, motor, and association nerves, and it is organized into a ______ pattern.
A
nerve net
B
spinal cord
C
ladderlike
D
endothelial
*select an answer for all questions
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