Question 1

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

Question 2

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 3

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 4

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. 
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.

Question 5

The photoreceptor cells in the crustacean compound eye are called

Accepted Answer

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

Question 6

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 7

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 evolution 
A)  serial homology. 
B)  telsonization. 
C)  arthropodization. 
D)  analogous homology. 
E)  Convergent evolution

Question 8

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

Question 9

The most diverse class of crustaceans is the __________________.

Accepted Answer

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

Question 10

The procuticle of crustaceans is often impregnated with __________________.

Accepted Answer

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

Question 11

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

Question 12

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 13

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 14

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. 
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.

Question 15

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

Question 16

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

Accepted Answer

The concept of homology refers to the ex

Question 17

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

Question 18

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

Question 19

The order that has been successful invading terrestrial environments is the

Accepted Answer

A)  amphipoda. 
B)  euphausiacea. 
C)  cladocera. 
D)  decapoda. 
E)  isopoda. 
A)  amphipoda. 
B)  euphausiacea. 
C)  cladocera. 
D)  decapoda. 
E)  isopoda.

Question 20

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

Accepted Answer

antennal g

Exam 20: Crustaceans

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

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?

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

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

The photoreceptor cells in the crustacean compound eye are called

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?

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

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

The most diverse class of crustaceans is the __________________.

The procuticle of crustaceans is often impregnated with __________________.

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

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

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

Molting and subsequent ecdysis in crustaceans

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

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

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

The tail fan of many malacostracans is

The order that has been successful invading terrestrial environments is the

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

Life: Biological Principles and the Science of Zoology

The Origin and Chemistry of Life

Cells As Units of Life

Cellular Metabolism

Genetics: a Review

Organic Evolution

The Reproductive Process

Principles of Development

Architectural Pattern of an Animal

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges and Placozoans

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Polyzoa and Kryptrochozoa

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Amniote Origins and Nonavian Reptiles

Birds

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Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation

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Digestion and Nutrition

Nervous Coordination: Nervous System and Sense Organs

Chemical Coordination: Endocrine System

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

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

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