The lidlike hatch on a trematode egg is called the
A) operculum.
B) scolex.
C) opisthaptor.
D) acetabulum.
E) cercaria.
Correct Answer:
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Q16: Among the flatworms,when a digestive tract is
Q17: The osmoregulatory organs of turbellarians are called
A)contractile
Q18: Asexual reproduction by fission in some turbellarians
Q19: Among those turbellarians possessing a digestive cavity,digestion
Q20: Most turbellarian species
A)are marine scavengers.
B)are internal parasites
Q22: The larval stage of the beef tapeworm
Q23: Nemerteans differ from flatworms in that they
Q24: The proboscis worms belong to the phylum
A)Proboscisoidea.
B)Nematoda.
C)Gnathostomulida.
D)Aspidogastrea.
E)Nemertea.
Q25: The larval stage of members of class
Q26: Tapeworms lack
A)reproductive organs.
B)a mouth and digestive tract.
C)excretory
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