Acoelomate Animals Question Preview (ID: 1143)


Platyhelminthes, Nemertea, And Gnathostomulida.

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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