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1 | |
The mandibulate arthropods characteristically have… |
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| | 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 |
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2 | |
Crustaceans… |
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| | 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 |
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3 | |
The 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 |
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4 | |
Decapod crustaceans typically have which of the following? |
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| | 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 |
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5 | |
Ecdysis in crustaceans… |
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| | 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 |
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6 | |
Crustaceans… |
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| | 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 |
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7 | |
Which 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 |
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8 | |
The crustaceans are the only arthropods with two pairs of antennae. |
|
| | A) | True |
| | B) | False |
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9 | |
Which of the following statements is incorrect? |
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| | 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 |
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10 | |
The muscular system of arthropods consists of antagonistic muscles called flexors and extensors |
|
| | A) | True |
| | B) | False |
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11 | |
The so-called “excretory organs” of aquatic mandibulates really regulate ionic and osmotic composition of body fluids. |
|
| | A) | True |
| | B) | False |
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12 | |
Which of the following is NOT correct? |
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| | 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 |
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13 | |
Which of the following is mismatched? |
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| | 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 |
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14 | |
The Class Malacostraca is the largest class of Crustacea and shows tremendous diversity. |
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| | A) | True |
| | B) | False |
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15 | |
Isopods are one of the few crustacean groups to have successfully invaded terrestrial habitats in addition to freshwater and seawater habitats. |
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| | A) | True |
| | B) | False |
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16 | |
Which of the following is a correct statement about the Order Decapoda? |
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| | 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 |
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17 | |
Among 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 |
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18 | |
The adaptive radiation demonstrated by crustaceans is great. |
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| | A) | True |
| | B) | False |
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19 | |
In the Crustacea, which of the following is under hormonal control? |
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| | A) | Premolt period |
| | B) | Postmolt period |
| | C) | Change in body color |
| | D) | Expression of sexual characteristics |
| | E) | All of the above are correct |
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20 | |
We now know that the branches of arthropod limbs are determined genetically. |
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| | A) | True |
| | B) | False |