Question 1

The nerves of the eyes and the two pairs of antennae connect to the

Accepted Answer

A)   statocyst.
B)   supraesophageal ganglion.
C)   subesophageal ganglion.
D)   thoracic ganglion.
E)   antennal glands.F) A) and C)
G) B) and E)

Question 2

The "bailer" of a crayfish that draws water over the gill filaments is a part of the

Accepted Answer

A)   second maxillae.
B)   caudal furca.
C)   third maxilliped.
D)   first walking leg.
E)   first swimmeret.F) B) and C)
G) C) and D)

Question 3

Medial and lateral processes on a crustacean limb are called __________ and __________ respectively.

Accepted Answer

A)   epiprocts, underprocts
B)   flexors, extensors
C)   exopods, endopods
D)   endites, exites
E)   terga, sternaF) C) and D)
G) C) and E)

Question 4

Position sensors in the base of the first antennae of crayfishes are called _______________.

Accepted Answer

The answer of Position sensors in the base of the...

Question 5

The order that has been successful invading terrestrial environments is the

Accepted Answer

A)   amphipoda.
B)   euphausiacea.
C)   cladocera.
D)   decapoda.
E)   isopoda.F) A) and B)
G) None of the above

Question 6

Molting and subsequent ecdysis in crustaceans

Accepted Answer

A)   involves production of a new cuticle and shedding of the old one.
B)   is initiated by a stimulus perceived by the central nervous system.
C)   involves a molt-inhibiting hormone produced by the X-organ of the eye stalk, and a molting hormone produced by the Y-organs near the mandibles.
D)   cues on stimuli such as day length, temperature, or humidity.
E)   All of the choices are correct.F) A) and C)
G) B) and D)

Question 7

Discuss how modulation in expression of the Distal-less gene determines the location of distal ends of arthropod limbs.What is the significance of this?

Accepted Answer

The modulation in expression of the Dist...

Question 8

The most accurate explanation of the management of nitrogenous wastes and ion balance in the crayfish is

Accepted Answer

A)   the nitrogenous waste of crustaceans is excreted by the green glands and ion diffusion takes place by diffusion across thin areas of cuticle and the gills.
B)   both ion balance and elimination of nitrogenous wastes is managed by the green glands.
C)   hydrostatic pressure in the green glands forces fluid into the hemocoel and both ions, and nitrogenous wastes diffuse across thin areas of cuticle and the gills.
D)   None of the choices are correct.
E)   the nitrogenous waste of crustaceans is excreted by diffusion across thin areas of cuticle and the gills, while the so-called excretory organs regulate ion composition of the hemolymph.F) A) and B)
G) B) and E)

Question 9

The procuticle of crustaceans is often impregnated with __________________.

Accepted Answer

The answer of The procuticle of crustaceans is often impregnated...

Question 10

How do the various pigments in the ommatidium work to provide images of variable field of vision or a continuous image in variable degrees of light and dark?

Accepted Answer

The various pigments in the ommatidium w...

Question 11

The tail fan of many malacostracans is

Accepted Answer

A)   the rostrum.
B)   the postcarapace.
C)   the endopod.
D)   a combination of uropods and telson.
E)   a fusion of the last biramous appendages.F) C) and D)
G) A) and D)

Question 12

The generalized appendage of a crustacean has a basal portion or protopod that has a lateral ______ and a medial _________.

Accepted Answer

A)   epiproct, underproct
B)   flexor, extensor
C)   exopod, endopod
D)   endite, exite
E)   tergum, sternumF) A) and D)
G) A) and C)

Question 13

In crustaceans,the molt-inhibiting hormone is produced in the ______________.

Accepted Answer

The answer of In crustaceans,the molt-inhibiting hormone is produced in...

Question 14

When the juvenile that hatches from an egg resembles a miniature adult,the development is described as __________________.

Accepted Answer

The answer of When the juvenile that hatches from an...

Question 15

The oldest ancestral and most widely-occurring larva in the Crustacea is

Accepted Answer

A)   a juvenile resembling the adult.
B)   the trochophore.
C)   the veliger.
D)   the nauplius.
E)   a planula.F) B) and C)
G) A) and E)

Question 16

The body plan of members of the class Malacostraca shows a standard pattern of appendage arrangement along the entire body that suggests

Accepted Answer

A)   serial homology.
B)   telsonization.
C)   arthropodization.
D)   analogous homology.
E)   Convergent evolutionF) A) and B)
G) A) and C)

Question 17

The most diverse class of crustaceans is the __________________.

Accepted Answer

The answer of The most diverse class of crustaceans is...

Question 18

What is the evidence that the major tagmata in crustaceans are not homologous?

Accepted Answer

The concept of homology refers to the ex...

Question 19

The organ in crayfish that functions in ion and water regulation and,to some extent,excretion is the ________ _________.

Accepted Answer

antennal g...

Question 20

The photoreceptor cells in the crustacean compound eye are called

Accepted Answer

A)   statocysts.
B)   statoliths.
C)   tactile hairs.
D)   gastroliths.
E)   ommatidia.F) D) and E)
G) B) and E)

Exam 20: Crustaceans

In crustaceans,the molt-inhibiting hormone is produced in the ______________.

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Position sensors in the base of the first antennae of crayfishes are called _______________.

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Molting and subsequent ecdysis in crustaceans

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How do the various pigments in the ommatidium work to provide images of variable field of vision or a continuous image in variable degrees of light and dark?

Correct AnswerAnswered by ExamLex AIThe various pigments in the ommatidium w...View AnswerShow Answer

The "bailer" of a crayfish that draws water over the gill filaments is a part of the

Correct AnswerverifiedShow Answer

The oldest ancestral and most widely-occurring larva in the Crustacea is

Correct AnswerverifiedShow Answer

Medial and lateral processes on a crustacean limb are called __________ and __________ respectively.

Correct AnswerverifiedShow Answer

The most diverse class of crustaceans is the __________________.

Correct AnswerverifiedShow Answer

When the juvenile that hatches from an egg resembles a miniature adult,the development is described as __________________.

Correct AnswerverifiedShow Answer

The body plan of members of the class Malacostraca shows a standard pattern of appendage arrangement along the entire body that suggests

Correct AnswerverifiedShow Answer

The tail fan of many malacostracans is

Correct AnswerverifiedShow Answer

Discuss how modulation in expression of the Distal-less gene determines the location of distal ends of arthropod limbs.What is the significance of this?

Correct AnswerAnswered by ExamLex AIThe modulation in expression of the Dist...View AnswerShow Answer

The generalized appendage of a crustacean has a basal portion or protopod that has a lateral ______ and a medial _________.

Correct AnswerverifiedShow Answer

What is the evidence that the major tagmata in crustaceans are not homologous?

Correct AnswerAnswered by ExamLex AIThe concept of homology refers to the ex...View AnswerShow Answer

The most accurate explanation of the management of nitrogenous wastes and ion balance in the crayfish is

Correct AnswerverifiedShow Answer

The order that has been successful invading terrestrial environments is the

Correct AnswerverifiedShow Answer

The photoreceptor cells in the crustacean compound eye are called

Correct AnswerverifiedShow Answer

The organ in crayfish that functions in ion and water regulation and,to some extent,excretion is the ________ _________.

Correct Answerverifiedantennal g...View AnswerShow Answer

The nerves of the eyes and the two pairs of antennae connect to the

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The procuticle of crustaceans is often impregnated with __________________.

Correct AnswerverifiedShow Answer

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The various pigments in the ommatidium w...
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Medial and lateral processes on a crustacean limb are called and respectively.

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The modulation in expression of the Dist...
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The generalized appendage of a crustacean has a basal portion or protopod that has a lateral and a medial ___.

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The concept of homology refers to the ex...
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The organ in crayfish that functions in ion and water regulation and,to some extent,excretion is the _.

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antennal g...
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