Acoelomate Animals: Question Preview (ID: 1143)


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While most of the Platyhelminthes are free living or endoparasites, which one of the following taxa has an ectoparasitic life cycle?
a) turbellaria b) trematoda c) monogenea d) cestoda
The members of the phylum Platyhelminthes are called flatworms because their bodies are flattened
a) posteriorly b) laterally c) anteriorly d) dorsoventrally
The cells that secrete mucus in the epidermis of the Turbellaria are called
a) parenchyma b) rhabdites c) cuticle cells d) teguments
The body of the parasisitc flatworms is covered in a syncytial layer called
a) parenchyma b) a rhabdite c) cuticle layer d) a tegument
The cells that form a meshwork filling the spaces between the muscles and organs that develops from the mesoderm is called
a) parenchyma b) rhabdite c) a cuticle layer d) a tegument
A cuticle is different from a tegument in that a cuticle is ______ while a tegument is _______.
a) syncytial, ciliated b) deaad, alive c) ciliated, dead d) alive, syncytial
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 secreted into the gut b) proteolytic enzymes are found in the lysosomes c) only parasitic feeding styles are used d) there is only one opening to the intestine
Another name for a protonephridium is a
a) syncytial layer b) microvillus c) tegument d) flame cell
The protonephridia function in
a) waste disposal b) respiration c) osmoregulation d) digestion
The nervous system of the flatworms has sensory, motor, and association nerves, and it is organized into a ______ pattern.
a) ladderlike b) spinal cord c) endothelial d) nerve net
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