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Chapter 19 Quiz
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1The mandibulate arthropods characteristically have…
A)Mandibles, pedipalps, and antennae
B)Mandibles, antennae, and maxillae
C)Mandibles, chelicerae, and antennae
D)Mandibles, maxillae, and pedipalps
E)None of the above is correct



2Crustaceans…
A)Are mostly marine, but there are freshwater and terrestrial species
B)Are primarily free-living with a few parasitic species
C)Have a cephalothorax and two pairs of antennae
D)All of the above are correct
E)None of the above is correct



3The crustaceans that are sessile and enclosed in a shell of calcareous plates are called:
A)Cirripedians
B)Isopods
C)Ostracods
D)Copepods
E)None of the above is correct



4Decapod crustaceans typically have which of the following?
A)Mandibles, pedipalps, and four pairs of walking legs
B)Five pairs of walking legs and three pairs of maxillipeds
C)Swimmerets, five pairs of walking legs, and chelicerae
D)One pair of antennae
E)None of the above is correct



5Ecdysis in crustaceans…
A)Is the physiological process of molting and making a larger cuticle
B)Is a physiological process initiated by a stimulus perceived by the nervous system
C)Involves a molt-inhibiting hormone produced by the X-organ on the eye stalk and a molting hormone produced by the Y-organs near the mandibles
D)All of the above are correct
E)None of the above is correct



6Crustaceans…
A)Breathe by means of tracheae
B)Excrete by means of Malpighian tubules
C)Have an open circulatory system
D)Are hermaphroditic
E)None of the above is correct



7Which of the following are associated with aquatic mandibulates?
A)Green glands
B)Nauplius larvae
C)Mandibles
D)Cephalothorax
E)All of the above are associated with aquatic mandibulates



8The crustaceans are the only arthropods with two pairs of antennae.
A)True
B)False



9Which of the following statements is incorrect?
A)All appendages of crustaceans, except perhaps the first antennae, are primitively biramous
B)Most crustaceans have between 16 and 20 somites
C)In decapods, the carapace covers the entire cephalothorax but not the abdomen
D)Walking legs, mouthparts, chelipeds, and swimmerets present a fine example of serial homology
E)The major body space in arthropods is a blood-filled hemocoel



10The muscular system of arthropods consists of antagonistic muscles called flexors and extensors
A)True
B)False



11The so-called “excretory organs” of aquatic mandibulates really regulate ionic and osmotic composition of body fluids.
A)True
B)False



12Which of the following is NOT correct?
A)Statolith—small grain of sand in the statocyst
B)Ommatidia—a photoreceptor unit
C)Nauplius—a widely occurring larval form in the Crustacea
D)Exocuticle—lies beneath the epicuticle and comprises protein, calcium salts, and chitin
E)Gastric mill—first part of the mandibles



13Which of the following is mismatched?
A)Class Remipedia—recently described taxon of only ten species
B)Class Branchiopoda—mostly freshwater forms such as cladocerans, anostracans, and notostracans.
C)Subclass Ostracoda—enclosed in a bivalve carapace, resembling tiny clams
D)Subclass Copepoda—some species form the most abundant animals in the oceans
E)Subclass Cirripedia—crabs, crayfish, and lobsters



14The Class Malacostraca is the largest class of Crustacea and shows tremendous diversity.
A)True
B)False



15Isopods are one of the few crustacean groups to have successfully invaded terrestrial habitats in addition to freshwater and seawater habitats.
A)True
B)False



16Which of the following is a correct statement about the Order Decapoda?
A)They have three pairs of maxillipeds
B)They have five pairs of walking legs
C)The first walking leg is usually modified into large pincers (chelae)
D)Crabs have a wider cephalothorax than crayfish and lobster
E)All of the above are correct



17Among the Crustacea, the Remipedia seem to have the most ancestral characteristics, with 25-38 trunk segments all bearing paired, biramous swimming appendages that are essentially alike.
A)True
B)False



18The adaptive radiation demonstrated by crustaceans is great.
A)True
B)False



19In the Crustacea, which of the following is under hormonal control?
A)Premolt period
B)Postmolt period
C)Change in body color
D)Expression of sexual characteristics
E)All of the above are correct



20We now know that the branches of arthropod limbs are determined genetically.
A)True
B)False







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