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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
cestoda
B
trematoda
C
turbellaria
D
monogenea
2) The members of the phylum Platyhelminthes are called flatworms because their bodies are flattened
A
anteriorly
B
laterally
C
dorsoventrally
D
posteriorly
3) The cells that secrete mucus in the epidermis of the Turbellaria are called
A
cuticle cells
B
parenchyma
C
rhabdites
D
teguments
4) The body of the parasisitc flatworms is covered in a syncytial layer called
A
a tegument
B
a rhabdite
C
cuticle layer
D
parenchyma
5) The cells that form a meshwork filling the spaces between the muscles and organs that develops from the mesoderm is called
A
a tegument
B
parenchyma
C
rhabdite
D
a cuticle layer
6) A cuticle is different from a tegument in that a cuticle is ______ while a tegument is _______.
A
ciliated, dead
B
deaad, alive
C
syncytial, ciliated
D
alive, syncytial
7) While the previous phyla have used intracellular digestion, within these three phyla extracellular digestion is the norm. Extracellular digestion means that
A
proteolytic enzymes are found in the lysosomes
B
there is only one opening to the intestine
C
only parasitic feeding styles are used
D
proteolytic enzymes are secreted into the gut
8) Another name for a protonephridium is a
A
microvillus
B
tegument
C
flame cell
D
syncytial layer
9) The protonephridia function in
A
digestion
B
respiration
C
osmoregulation
D
waste disposal
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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