Question 1

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 are correct 
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 are correct D

Question 2

The central axis around which the shell of a snail coils is called the

Accepted Answer

A)  aperture. 
B)  columella. 
C)  sinistral. 
D)  dextral. 
E)  torsion. 
A)  aperture. 
B)  columella. 
C)  sinistral. 
D)  dextral. 
E)  torsion. B

Question 3

What surface (e.g.,dorsal,ventral,anterior,posterior)of the squid faces forward as the animal moves by jet propulsion? What surface faces forward in a swimming cuttlefish? Explain your answers.

Accepted Answer

In squid, when moving by jet propulsion, the ventral surface faces forward. Squid have a unique mode of locomotion where they expel water from their mantle cavity through a siphon located beneath the head. The siphon can be directed backwards, propelling the squid forward. Since the ventral side is where the siphon and the arms are located, this side faces the direction of movement.

In contrast, a swimming cuttlefish often moves with its dorsal surface facing forward. Cuttlefish also use jet propulsion to move, expelling water through their siphon. However, cuttlefish have a more developed fin that runs around the edge of their mantle. They can undulate this fin to swim more slowly and with greater maneuverability. When using their fins for swimming, they often orient themselves with the dorsal side leading, which is the opposite of how squid typically move.

The difference in orientation between squid and cuttlefish when moving can be attributed to their different body structures and swimming behaviors. Squid are generally more streamlined and built for fast, open-water jet propulsion, while cuttlefish have a broader, more flexible fin structure that allows for more controlled and varied movements in a range of environments, including more complex reef habitats.

Question 4

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 5

How has the problem of "fouling" been resolved by the various groups of molluscs?

Accepted Answer

The problem of "fouling" has been resolv

Question 6

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

Accepted Answer

Opisthobranchs and pulmonates are indeed

Question 7

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 8

You find an old living freshwater clam.The health department would like to check a small sample of the shell for pollutant levels when it was young.Where should they remove this oldest shell material?

Accepted Answer

To determine the pollutant levels from w

Question 9

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 10

A pair of _______________ serve as sense organs for sampling water and are found in the mantle grooves near the anus of many chitons.

Accepted Answer

The answer of A pair of _______________ serve as sense...

Question 11

Gaseous exchange in gastropods may involve

Accepted Answer

A)  gills. 
B)  lungs. 
C)  mantle. 
D)  body surface. 
E)  All of the choices are correct 
A)  gills. 
B)  lungs. 
C)  mantle. 
D)  body surface. 
E)  All of the choices are correct

Question 12

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 13

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 14

Snails that lack gills are called "pulmonate" and their mantle cavity functions

Accepted Answer

A)  for propulsion. 
B)  to produce pearls. 
C)  as a lung. 
D)  to store wastes. 
E)  All of the choices are correct functions 
A)  for propulsion. 
B)  to produce pearls. 
C)  as a lung. 
D)  to store wastes. 
E)  All of the choices are correct functions

Question 15

Early gastropods had a coiled shell that did not twist to the right or left; this bilaterally symmetrical shell is called

Accepted Answer

A)  sinistral. 
B)  planospiral. 
C)  conispiral. 
D)  dextral. 
E)  scaphopodal. 
A)  sinistral. 
B)  planospiral. 
C)  conispiral. 
D)  dextral. 
E)  scaphopodal.

Question 16

The nudibranchs belong to the

Accepted Answer

A)  scaphopoda. 
B)  pelecypoda. 
C)  prosobranchia. 
D)  opisthobranchia. 
E)  pulmonata. 
A)  scaphopoda. 
B)  pelecypoda. 
C)  prosobranchia. 
D)  opisthobranchia. 
E)  pulmonata.

Question 17

The tongue-like,rasping organ in the head of many molluscs is the _____________.

Accepted Answer

The answer of The tongue-like,rasping organ in the head of...

Question 18

The scaphopods have a shell that resembles a straightened gastropod shell.Why are they not classified with the gastropods?

Accepted Answer

Scaphopods, commonly known as tusk shell

Question 19

Where would you locate the coelomic cavity when dissecting a mollusk such as a clam?

Accepted Answer

A)  The coelom is between the mantle and the shell 
B)  The coelom is all of the area enclosed by the two shells and exposed when you open the shell 
C)  The cavity around the heart, the kidneys, and the lumen of the gonads forms the limited coelom 
D)  The cavities inside the siphon are the coelom 
E)  The coelom is the space inside small tubules that form the gills 
A)  The coelom is between the mantle and the shell 
B)  The coelom is all of the area enclosed by the two shells and exposed when you open the shell 
C)  The cavity around the heart, the kidneys, and the lumen of the gonads forms the limited coelom 
D)  The cavities inside the siphon are the coelom 
E)  The coelom is the space inside small tubules that form the gills

Question 20

Describe five features,morphological or developmental,that would most likely be found in the earliest ancestral mollusc.

Accepted Answer

1. Bilateral symmetry: The earliest ance

Exam 16: Molluscs

The water current in the body of a cephalopod mollusc provides

The central axis around which the shell of a snail coils is called the

What surface (e.g.,dorsal,ventral,anterior,posterior)of the squid faces forward as the animal moves by jet propulsion? What surface faces forward in a swimming cuttlefish? Explain your answers.

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

How has the problem of "fouling" been resolved by the various groups of molluscs?

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

The Monoplacophora

You find an old living freshwater clam.The health department would like to check a small sample of the shell for pollutant levels when it was young.Where should they remove this oldest shell material?

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

A pair of _______________ serve as sense organs for sampling water and are found in the mantle grooves near the anus of many chitons.

Gaseous exchange in gastropods may involve

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

Cultured pearls are made by

Snails that lack gills are called "pulmonate" and their mantle cavity functions

Early gastropods had a coiled shell that did not twist to the right or left; this bilaterally symmetrical shell is called

The nudibranchs belong to the

The tongue-like,rasping organ in the head of many molluscs is the _____________.

The scaphopods have a shell that resembles a straightened gastropod shell.Why are they not classified with the gastropods?

Where would you locate the coelomic cavity when dissecting a mollusk such as a clam?

Describe five features,morphological or developmental,that would most likely be found in the earliest ancestral mollusc.

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

Radiate Animals

Acoelomorpha,Platyzoa,and Mesozoa

Polyzoa and Kryptrochozoa

Annelids and Allied Taxa

Smaller Ecdysozoans

Trilobites, Chelicerates, and Myriapods

Crustaceans

Support, Protection, and Movement

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 Distributions

Animal Ecology

Filters