Question 1

The circulatory system of cephalopods is more efficient than that of other molluscs because

Accepted Answer

A) it places the systemic circulation before the gills. 
B) it is a closed network of vessels. 
C) all blood is circulated through the gill filaments. 
D) accessory or brachial hearts increase blood pressure before blood flows through the gills. 
E) All of the choices are correct 
A) it places the systemic circulation before the gills. 
B) it is a closed network of vessels. 
C) all blood is circulated through the gill filaments. 
D) accessory or brachial hearts increase blood pressure before blood flows through the gills. 
E) All of the choices are correct

Question 2

When cephalopods hatch from their eggs,they are

Accepted Answer

A) trochophore larvae. 
B) glochidial parasites. 
C) helpless,sessile larvae that must metamorphose into adult forms. 
D) juveniles that resemble small adults. 
E) There is much variation and all of the above occur among the various cephalopods 
A) trochophore larvae. 
B) glochidial parasites. 
C) helpless,sessile larvae that must metamorphose into adult forms. 
D) juveniles that resemble small adults. 
E) There is much variation and all of the above occur among the various cephalopods

Question 3

Cultured pearls are made by

Accepted Answer

A) cutting spherical balls from the thick shell of oysters and polishing them into circular beads. 
B) dropping a grain of sand into the incurrent siphon of a pearl oyster. 
C) tying off the labial palps. 
D) growing oysters in high-calcium waters where they produce the pearls as unfertilized eggs. 
E) placing an irritating particle under the shell mantle. 
A) cutting spherical balls from the thick shell of oysters and polishing them into circular beads. 
B) dropping a grain of sand into the incurrent siphon of a pearl oyster. 
C) tying off the labial palps. 
D) growing oysters in high-calcium waters where they produce the pearls as unfertilized eggs. 
E) placing an irritating particle under the shell mantle.

Question 4

The Monoplacophora

Accepted Answer

A) lack a shell. 
B) live in fresh water. 
C) lack a foot. 
D) have several internal organs that are serially repeated. 
E) All of the choices are correct 
A) lack a shell. 
B) live in fresh water. 
C) lack a foot. 
D) have several internal organs that are serially repeated. 
E) All of the choices are correct

Question 5

The ______________ is the layer on the outside of the clam or mussel shell that provides protection from acidic water and may be colored to hide the clam in the mud.

Accepted Answer

The answer of The ______________ is the layer on the...

Question 6

A Nautilus differs from a snail because

Accepted Answer

A) the snail body occupies the whole shell and the Nautilus mainly lives in the last chamber. 
B) the Nautilus is the last representative of a once flourishing group while snails belong to a most abundant modern group. 
C) the Nautilus generates gas in the chambers for buoyancy during swimming and a snail does not. 
D) All of the choices are differences 
E) None of the choices is correct 
A) the snail body occupies the whole shell and the Nautilus mainly lives in the last chamber. 
B) the Nautilus is the last representative of a once flourishing group while snails belong to a most abundant modern group. 
C) the Nautilus generates gas in the chambers for buoyancy during swimming and a snail does not. 
D) All of the choices are differences 
E) None of the choices is correct

Question 7

The intromittent organ of male cephalopods is the

Accepted Answer

A) pedipalp,a modified labial palp. 
B) hectocotylus,a modified arm. 
C) aedeagus,a modified beak. 
D) penis,the first structure homologous to the mammalian reproductive structure. 
E) baculum,a modified piece of internal shell. 
A) pedipalp,a modified labial palp. 
B) hectocotylus,a modified arm. 
C) aedeagus,a modified beak. 
D) penis,the first structure homologous to the mammalian reproductive structure. 
E) baculum,a modified piece of internal shell.

Question 8

The membranes that hold the internal organs in place in coelomates are called ______________.

Accepted Answer

The answer of The membranes that hold the internal organs...

Question 9

Opisthobranchs and pulmonates are both gastropods.What are their main distinguishing features?

Accepted Answer

Opisthobranchs and pulmonates are indeed

Question 10

The ________ _________ projects into a bivalve stomach to keep the contents whirling while releasing digestive enzymes.

Accepted Answer

The answer of The ________ _________ projects into a bivalve...

Question 11

Which of the following statements is NOT TRUE of cephalopods?

Accepted Answer

A) Most have color vision 
B) Visual acuity underwater surpasses that of humans 
C) Can be taught to discriminate between shapes 
D) Sensory systems are more elaborate than in other molluscs 
E) Brain is the largest of any invertebrate 
A) Most have color vision 
B) Visual acuity underwater surpasses that of humans 
C) Can be taught to discriminate between shapes 
D) Sensory systems are more elaborate than in other molluscs 
E) Brain is the largest of any invertebrate

Question 12

Most freshwater clams have a bivalve ___________ stage that attaches to the gills and lives as a parasite for a few weeks.

Accepted Answer

A) Veliger 
B) Trochophore 
C) Brachial 
D) Miracidia 
E) Glochidia 
A) Veliger 
B) Trochophore 
C) Brachial 
D) Miracidia 
E) Glochidia

Question 13

The circulatory system of cephalopods is more efficient than other molluscs because it has accessory or ________ _______ at the base of each gill.

Accepted Answer

The answer of The circulatory system of cephalopods is more...

Question 14

Cephalopods feed on

Accepted Answer

A) microscopic organisms. 
B) fish,molluscs,crustaceans,and worms. 
C) seaweed. 
D) whales and porpoises. 
E) None of the choices is correct 
A) microscopic organisms. 
B) fish,molluscs,crustaceans,and worms. 
C) seaweed. 
D) whales and porpoises. 
E) None of the choices is correct

Question 15

The main structures that taste food and direct it into the mouth of a clam is/are

Accepted Answer

A) the gills. 
B) labial palps. 
C) the siphons. 
D) the gastric mill. 
E) adductor muscles. 
A) the gills. 
B) labial palps. 
C) the siphons. 
D) the gastric mill. 
E) adductor muscles.

Question 16

Which correctly describes the evolutionary origin and adaptive radiation of molluscs?

Accepted Answer

A) Molluscs originated in freshwater and invaded both terrestrial and marine environments 
B) Molluscs originated on land,all classes then invaded both freshwater and marine environments 
C) Molluscs originated on land,all classes then invaded freshwater and the bivalves and gastropods invaded marine environments 
D) Molluscs originated in the sea,both bivalves and gastropods invaded marine environments and the land 
E) Molluscs originated in the sea,bivalves and gastropods invaded brackish and freshwater environments,and just gastropods invaded the land 
A) Molluscs originated in freshwater and invaded both terrestrial and marine environments 
B) Molluscs originated on land,all classes then invaded both freshwater and marine environments 
C) Molluscs originated on land,all classes then invaded freshwater and the bivalves and gastropods invaded marine environments 
D) Molluscs originated in the sea,both bivalves and gastropods invaded marine environments and the land 
E) Molluscs originated in the sea,bivalves and gastropods invaded brackish and freshwater environments,and just gastropods invaded the land

Question 17

The newest clam shell is built

Accepted Answer

A) on the outside so the periostracum is the newest material. 
B) on the inside so the inside nacreous layer is the newest. 
C) both directions outward from the central prismatic layer. 
D) all at once;all layers of shell are the same age. 
E) None of the choices is correct 
A) on the outside so the periostracum is the newest material. 
B) on the inside so the inside nacreous layer is the newest. 
C) both directions outward from the central prismatic layer. 
D) all at once;all layers of shell are the same age. 
E) None of the choices is correct

Question 18

The genus _____________ contains some members that have a toxin strong enough to kill humans.

Accepted Answer

A) Tegelu 
B) Cyphom 
C) Halioti 
D) Conus 
E) Neopilina 
A) Tegelu 
B) Cyphom 
C) Halioti 
D) Conus 
E) Neopilina

Question 19

Of all of the freshwater organisms,more freshwater clams are becoming endangered than other species.What is the likely reason?

Accepted Answer

A) They are a primitive animal and they are due for natural extinction 
B) The shellfish industry has moved inland and we are overharvesting them for human food 
C) Clams are more heavily parasitized than any other molluscan group 
D) As filter-feeders,they concentrate pollutants and are more likely to be harmed by water pollution 
E) All of the choices are correct 
A) They are a primitive animal and they are due for natural extinction 
B) The shellfish industry has moved inland and we are overharvesting them for human food 
C) Clams are more heavily parasitized than any other molluscan group 
D) As filter-feeders,they concentrate pollutants and are more likely to be harmed by water pollution 
E) All of the choices are correct

Question 20

The water current in the body of a cephalopod mollusc provides

Accepted Answer

A) oxygen for respiration. 
B) jet power for rapid locomotion. 
C) a means of carrying wastes and gametes out of the body. 
D) All of the choices are cephalopod uses for their body water currents 
E) None of the choices is correct Review "Form and Function" in chapter 16.Water circulating through the mantle cavity,over the gills,and exiting via the siphon serves in locomotion,gas exchange,and as a means to remove wastes and reproductive products from the body. 
A) oxygen for respiration. 
B) jet power for rapid locomotion. 
C) a means of carrying wastes and gametes out of the body. 
D) All of the choices are cephalopod uses for their body water currents 
E) None of the choices is correct Review "Form and Function" in chapter 16.Water circulating through the mantle cavity,over the gills,and exiting via the siphon serves in locomotion,gas exchange,and as a means to remove wastes and reproductive products from the body.

Exam 16: Molluscs

The circulatory system of cephalopods is more efficient than that of other molluscs because

When cephalopods hatch from their eggs,they are

Cultured pearls are made by

The Monoplacophora

The ______________ is the layer on the outside of the clam or mussel shell that provides protection from acidic water and may be colored to hide the clam in the mud.

A Nautilus differs from a snail because

The intromittent organ of male cephalopods is the

The membranes that hold the internal organs in place in coelomates are called ______________.

Opisthobranchs and pulmonates are both gastropods.What are their main distinguishing features?

The ________ _________ projects into a bivalve stomach to keep the contents whirling while releasing digestive enzymes.

Which of the following statements is NOT TRUE of cephalopods?

Most freshwater clams have a bivalve ___________ stage that attaches to the gills and lives as a parasite for a few weeks.

The circulatory system of cephalopods is more efficient than other molluscs because it has accessory or ________ _______ at the base of each gill.

Cephalopods feed on

The main structures that taste food and direct it into the mouth of a clam is/are

Which correctly describes the evolutionary origin and adaptive radiation of molluscs?

The newest clam shell is built

The genus _____________ contains some members that have a toxin strong enough to kill humans.

Of all of the freshwater organisms,more freshwater clams are becoming endangered than other species.What is the likely reason?

The water current in the body of a cephalopod mollusc provides

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

Annelids and Allied Taxa

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Crustaceans

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

The _ projects into a bivalve stomach to keep the contents whirling while releasing digestive enzymes.

The circulatory system of cephalopods is more efficient than other molluscs because it has accessory or __ _ at the base of each gill.