a characteristic structure found in many mollusks is the radula, which is involved in

a. eating

b. reproduction

c. opening and closing of the shell

d. jet propulsion

true coelom: mollusks and annelids::

a. siphon: annelids

b. segmentation: annelids

c. tentacle: annelids

d. valve annelids

in an open circulatory system

a. lungs branch into small tubules to provide oxygen to tissues

b. blood is released directly into spaces in the body tissues

c. wastes are eliminated directly to the environment from the tissues

d. water is drawn into the mantle cavity to provide oxygen to body tissues

which of the following mollusks have a closed circulatory system

a. snails

b. slugs

c. cephalopods

d. gastropods

jet propulsion in a squid is the result of

a. strong contractions of the tentacles

b. rapid closing of the organism's shell

c. high pressure discharge of fluid from the organism's mouth

d. the pumping of water through the siphon

trochophores

a. possess a belt of cilia around their bodies

b. occur in some annelids life cycles

c. occur in some mollusks life cycles

d. all of the above

earthworms are considered to be beneficial to the envirionment because

a. they help release nutrients into the soil

b. they break up the soil in which they live

c. they aerate the soil as they move through it

d. all of the above

shells of mollusks

a. allow for the attachment of muscles

b. provide protection

c. may consist of one or more pieces

d. all of the above

which of the following are not part of an earthworms body

a. gills

b. nephridia

c. typhlosole

d. heart

the evolution of a coelom was significant because

a. it eliminated the need for a circulatory system

b. more wastes could be stored before excretion

c. it enabled development of more complex organs

d. more food could be stored within it

leeches: blood::

a. earthworms: blood

b. marine: polychaetes: blood

c. marine polychaetes: small animals

d. earthworms: small animals

which of the following has a true coelom

a. roundworm

b. mollusk

c. flatworm

d. rotifer

which of the following is not a characteristic of at least some mollusks

a. bilateral symmetry

b. pseudocoelomate body plan

c. mantle

d. open circulatory system

which is a correct pairing

a. phylum mollusca- octopus

b. phylum platyhelmenthes- hydra

c. phylum nematoda- planaria

d. phylum annelida- roundworm

all of the following are classes of the phylum mollusca except

a. gastropods

b. bivalves

c. cephalopods

d. pseudopods

the cilia of a trochophore

a. are necessary for reproduction

b. allow attachment to the ocean bottom

c. cover the entire larval body

d. create currents for drawing in food

earthworm movement: circular muscles and setae::

a. earthworm respiration: skin

b. earthworm digestion: circular muscles and setae

c. earthworm reproduction: pharynx

d. earthworm digestion: seminal receptacles

among the various species of gastropods, respiration may take place

a. with gills

b. within the mantle cavity

c. through the skin

d. all of the above

adductor muscles are responsible for

a. fanning the gills of aquatic mollusks

b. pumping the hearts of mollusks

c. moving the valves of bivalves

d. extending the feet of mollusks

a clam is an example of a

a. trochophore

b. bivalve

c. gastropod

d. cephalopod

an example of segmentation in humans is the

a. vertebral column

b. skin

c. brain

d. digestive system

a similarity between annelids and arthropods is that they both have

a. segmented body patterns

b. the ability to fly

c. well developed lungs for respiration

d. exoskeletons made of chitin

the most significant evolutionary advancement of annelids over mollusks is believed to be

a. the existance of a true coelom

b. the ability to burrow

c. segmentation

d. cephalization

c. segmentation

the digestive tube of the earthworm is divided into three regions. which of the following isnt one of them

a. gizzard

b. crop

c. radula

d. intestine

leeches

a. are segmented

b. use suckers to aid in movement

c. may be parasitic

d. all of the above

each segment of an annelid

a. has a pseudocoelom

b. has a well developed brain that allows the annelid to learn simple tasks

c. is capable of reproduction

d. may contain some organ systems that duplicate systems in other segments

the advantage of a closed circulatory system over an open circulatory system is that

a. lungs are able to function in animals with a closed circulatory system

b. blood moves more efficienly through the tubes of a closed circulatory system

c. blood is able to be pumped by a muscular heart in a closed circulatory system

d. a closed circulatory system prevents blood from leaking out of the body.

the body of the water leech

a. has suckers on the front and back

b. is segmented

c. has no parapodia

d. all of the above

all of the cephalopods

a. are predators

b. have eight tentacles

c. are filter feeders

d. posses protective shells

twisting of the visceral mass of gastropods is called

a. torsion

b. inversion

c. extension

d. conversion

segmented worms are known as

a. arthropods

b. nematodes

c. planarians

d. annelids

all of the animal phyla that evolved after the mollusks

a. lack mesoderm

b. are vertebrates

c. are prokaryotes

d. have a coelom

the only cephalopod that has retained its external shell is the

a. octopus

b. chambered nautilus

c. squid

d. cuttlefish

small tubules that collect wastes from the coelom of annelids and discharge the wastes from the body are called

a. radulae

b. nephridia

c. bivalves

d. spicules

jet propulsion is the usual means of locomotion in water for

a. bivalves

b. octopuses

c. squids

d. gastropods

coordinated movements of an earthworm's body segments are possible because of the

a. development of an advanced brain

b. ventral nerve cord and ganglia that carry impulses to the muscles

c. presence of a true coelom in the earthworms body

d. existence of a complete digestive system

the clitellum of an earthworm

a. is necesary for movement

b. contains the heart

c. is associated with reproduction

d. acts as a primitive respiratory system

mollusks: a mantle::

a. roundworms: coelom

b. mollusks: coelom

c. pseudocoelomate animals: true body cavities

d. roundworms: single opening digestive tract

squid motion: siphon::

a. annelid motion: siphon

b. annelid motion: tentacles

c. annelid breathing: nephridia

d. earthworm circulation: closed circulation