Question 1

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 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

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 4

What is the function of the green glands in the crayfish?

Accepted Answer

A) Secrete fluids to aid digestion 
B) Increase oxygen absorption for respiration 
C) Sensing vibrations in water 
D) Reproduction 
E) Excretion 
A) Secrete fluids to aid digestion 
B) Increase oxygen absorption for respiration 
C) Sensing vibrations in water 
D) Reproduction 
E) Excretion

Question 5

Both clams and crabs are referred to in common terminology as "shellfish." However,zoologists do not consider them to be closely related.Provide a contrasting list of the differences between the crustacean decapods and the molluscan bivalves.

Accepted Answer

Certainly! Clams and crabs, while both a

Question 6

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 7

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 8

Crustacea are biramous,meaning they possess

Accepted Answer

A) a telson tail. 
B) two large pincers. 
C) two pair of antennae. 
D) jointed appendages having two branches. 
E) a body divided into two regions,the cephalothorax and abdomen. 
A) a telson tail. 
B) two large pincers. 
C) two pair of antennae. 
D) jointed appendages having two branches. 
E) a body divided into two regions,the cephalothorax and abdomen.

Question 9

Since the hemolymph of crustaceans leaves the heart by arteries,why is it considered an open rather than a closed system?

Accepted Answer

A) The hemolymph lacks any respiratory pigments. 
B) The hemolymph flows through the hemocoel and returns via venous sinuses rather than enclosed veins. 
C) The heart does not pump hemolymph but it moves by ciliary action instead. 
D) The arteries "dead end" and the hemolymph must backflow through the arteries. 
E) The hemolymph lacks any respiratory function. 
A) The hemolymph lacks any respiratory pigments. 
B) The hemolymph flows through the hemocoel and returns via venous sinuses rather than enclosed veins. 
C) The heart does not pump hemolymph but it moves by ciliary action instead. 
D) The arteries "dead end" and the hemolymph must backflow through the arteries. 
E) The hemolymph lacks any respiratory function.

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

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 12

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

Accepted Answer

The concept of homology refers to the ex

Question 13

If crayfish are raised in a very clean aquarium that only has iron filings in the floor,and they are allowed to go through several molts so that an iron filing is now serving as a statolith,what would be the effect of a large magnet suspended above the aquarium?

Accepted Answer

A) There would be no effect at all. 
B) The crayfish would swim sideways. 
C) The crayfish would swim upside down. 
D) The crayfish would be unable to detect food. 
E) The crayfish would be blind. 
A) There would be no effect at all. 
B) The crayfish would swim sideways. 
C) The crayfish would swim upside down. 
D) The crayfish would be unable to detect food. 
E) The crayfish would be blind.

Question 14

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 is 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 is 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 15

The respiratory apparatus of a crayfish is

Accepted Answer

A) a set of gills under the carapace. 
B) book lungs inside the carapace. 
C) a set of gills along the underside of the tail. 
D) tracheal tubes throughout the body. 
E) a cluster of alveoli under the tail. 
A) a set of gills under the carapace. 
B) book lungs inside the carapace. 
C) a set of gills along the underside of the tail. 
D) tracheal tubes throughout the body. 
E) a cluster of alveoli under the tail.

Question 16

Which is a correct association of pigment and function in an arthropod compound eye?

Accepted Answer

A) Strong light-distal retinal pigment disappears 
B) Strong light-each ommatidium is shielded from the others and sees only a limited area 
C) Strong light-distal and proximal pigments separate 
D) Dim light-each ommatidium is shielded from the others and sees only a limited area 
E) Dim light-distal and proximal pigments fuse 
A) Strong light-distal retinal pigment disappears 
B) Strong light-each ommatidium is shielded from the others and sees only a limited area 
C) Strong light-distal and proximal pigments separate 
D) Dim light-each ommatidium is shielded from the others and sees only a limited area 
E) Dim light-distal and proximal pigments fuse

Question 17

The major body space in arthropods is called the ______________.

Accepted Answer

The answer of The major body space in arthropods is...

Question 18

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

Accepted Answer

antennal g

Question 19

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 20

How do crustacea differ from other arthropod groups?

Accepted Answer

A) They possess a telson tail 
B) Only crustaceans have two pairs of antennae 
C) Only crustaceans have chitinous exoskeletons 
D) Only Crustacea possess a two-part body plan of cephalothorax and abdomen 
E) A hemocoel is only found in Crustacea 
A) They possess a telson tail 
B) Only crustaceans have two pairs of antennae 
C) Only crustaceans have chitinous exoskeletons 
D) Only Crustacea possess a two-part body plan of cephalothorax and abdomen 
E) A hemocoel is only found in Crustacea

Exam 20: Crustaceans

The photoreceptor cells in the crustacean compound eye are called

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?

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

What is the function of the green glands in the crayfish?

Both clams and crabs are referred to in common terminology as "shellfish." However,zoologists do not consider them to be closely related.Provide a contrasting list of the differences between the crustacean decapods and the molluscan bivalves.

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

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

Crustacea are biramous,meaning they possess

Since the hemolymph of crustaceans leaves the heart by arteries,why is it considered an open rather than a closed system?

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?

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

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

If crayfish are raised in a very clean aquarium that only has iron filings in the floor,and they are allowed to go through several molts so that an iron filing is now serving as a statolith,what would be the effect of a large magnet suspended above the aquarium?

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

The respiratory apparatus of a crayfish is

Which is a correct association of pigment and function in an arthropod compound eye?

The major body space in arthropods is called the ______________.

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

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

How do crustacea differ from other arthropod groups?

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

Architectual Pattern of an Animal

Taxonomy and Phylogeny of Animals

Unicellular Eukaryotes

Sponges and Placozoans

Cnidarians and Ctenophores

Acoelomorpha, Platyzoa, and Mesozoa

Polyzoa and Kryptrochozoa

Molluscs

Annelids and Allied Taxa

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Hexapods

Chaetognaths, echinoderms, and Hemichordates

Chordates

Fishes

Early Tetrapods and Modern Amphibians

Amniote Origins and Nonavian Reptiles

Birds

Mammals

Support, Protection, and Movement

Homeostasis: Osmotic Regulation, Excretion, and Temperature Regulation

Homeostasis: Internal Fluids and Respiration

Digestion and Nutrition

Nervous Coordination: Nervous System and Sense Organs

Chemical Coordination: Endocrine System

Immunity

Animal Behavior

Animal Distribution

Animal Ecology

Filters

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

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

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