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 Chapter 33, 10th edition
Q1.Sponges feed by __________. ( Concept 33.1)
A) B) C) D) E) paralyzing small crustaceans with stinging cells
absorbing nutrients from the guts of their hosts
scraping bacteria and algae from hard substrates
performing photosynthesis
filtering small particles from water
The Answer is : E
Q2.Sponges lack __________. ( Concept 33.1)
A) B) C) D) E) true tissues
the ability to make organic compounds from CO2 and water
a nervous system
a complete digestive tract
All of the listed responses are correct.
The Answer is : E
Q3.Some digestion in sponges takes place in the __________. ( Concept 33.1)
A) B) C) D) E) spongocoel
gastrovascular cavity
osculum
gastrointestinal tract
amoebocytes
The Answer is : E
Q4.Which of the following is/are characteristic of sponges? ( Concept 33.1)
A) B) C) D) E) The Answer is : D
They have holes, or pores, in specialized cells, through which water enters.
They consist of two layers of cells with a noncellular gelatinous layer between them.
They have collar cells.
All of the listed responses are correct.
None of the listed responses is correct.
Q5.Which of the following features is characteristic of the poriferan (sponge) body plan or life history? ( Concept
33.1)
A) B) C) D) E) closed circulatory system
motile larvae
extracellular digestion
ventral nerve chord
specialized respiratory surfaces
The Answer is : B
Q6.Some cnidarians go through both a motile stage and a sessile (attached) stage during their life cycle. The
attached stage is called a(n) __________. ( Concept 33.2)
A) B) C) D) E) polyp
medusa
embryo
mesoglea
larva
The Answer is : D
Q7.Through what means do coral animals capture their food? ( Concept 33.2)
A) B) C) D) E) dinoflagellates (photosynthetic protists that live in the coral's tissues)
teeth that shred their prey
tentacles that trap food particles
absorption of predigested food from their prey
filter feeding
The Answer is : C
Q8.__________ are members of the phylum __________ and feed by __________. ( Concept 33.2)
A) Bivalves ... Annelida ... killing small animals with electric shock
B) Leeches ... Porifera ... filtering tiny particles from water passing through their bodies
C) Sea anemones ... Cnidaria ... using stinging cells to capture small animals that venture too
close to them
D) Rotifers ... Arthropoda ... a lophophore
E) Sponges ... Urochordata ... scraping away organic films covering the rocks on which they grow
The Answer is : C
Q9.The choanocyte of a sponge and the nematocyst of a cnidarian both function in __________. ( Concept
33.2)
A) B) C) D) E) locomotion
obtaining food
sight
locating mates
reproduction
The Answer is : B
Q10.Which of the following is true about the phylum Cnidaria? ( Concept 33.2)
A) B) C) D) E) All cnidarians except corals are in the medusa stage.
The bodies of cnidarians are bilaterally symmetrical and show cephalization.
This phylum has more species than any other phylum.
The bodies of its members are organized around a gastrovascular cavity.
All of the listed responses are correct.
The Answer is : D
Q11.Tapeworms are highly specialized worms that make their living as endoparasites. To which of the following
phyla do the tapeworms belong? ( Concept 33.3)
A) B) C) D) E) phylum Mollusca
phylum Arthropoda
phylum Nematoda
phylum Platyhelminthes
phylum Annelida
The Answer is : D
Q12.Which of the following groups of worms is/are completely parasitic? ( Concept 33.3)
A) B) C) D) E) The Answer is : D
catenulids
platyhelminths
rhabditophorans
trematodes
All of the listed responses are correct.
Q13.The proglottids of a tapeworm contain an elaborate __________ system. ( Concept 33.3)
A) B) C) D) E) sensory
circulatory
digestive
attachment
reproductive
The Answer is : E
Q14.Some species of rotifers undergo parthenogenesis, which means that __________. ( Concept 33.3)
A) the species consist only of females that produce more females from unfertilized eggs
B) their larval stage of development looks completely different from the adult stage
C) each individual functions as both male and female in sexual reproduction by producing sperm
and eggs
D) during development of adult forms, some of the organs that were bilateral are reduced in size
or are lost on one side of the body
E) they shed their exoskeleton as they grow
The Answer is : A
Q15.Consider the following list of animals: giant squid, earthworm, largemouth bass, snail, tapeworm, coral, and
starfish. The two that belong to the same phylum are the __________, and their phylum is __________. (
Concept 33.3)
A) B) C) D) E) giant squid and snail ... Mollusca
coral and starfish ... Echinodermata
earthworm and tapeworm ... Annelida
bass and giant squid ... Mollusca
snail and coral ... Annelida
The Answer is : A
Q16.An active marine predator is found possessing these characteristics: a series of tentacles (modified from
the foot), a highly developed nervous system, and elaborate eyes. To which of the following clades does this
organism most likely belong? ( Concept 33.3)
A) B) C) D) E) The Answer is : A
Cephalopoda
Chelicerata
Bivalvia
Errantia
Polyplacophora
Q17.Cephalopods are the only molluscs __________. ( Concept 33.3)
A) B) C) D) E) with a closed circulatory system
that reproduce sexually
that are hermaphrodites
that have a mantle that produces an external shell
with segmented bodies
The Answer is : A
Q18.Annelids __________. ( Concept 33.3)
A) B) C) D) E) include leeches, earthworms, and flatworms
have characteristically long bodies with external, but not internal, segmentation
have a mouth that is separate from the anus
use their pseudocoeloms as hydrostatic skeletons
All of the listed responses are correct.
The Answer is : C
Q19.Which of the following are lophotrochozoans that have a lophophore? ( Concept 33.3)
A) B) C) D) E) nematodes
tapeworms
sea urchins
brachiopods
cephalopods
The Answer is : D
Q20.Which of the following phyla contains animals that are lophotrochozoans with a mouth, anus, and true
coelom? ( Concept 33.3)
A) Rotifera
B) Cnidaria
C) Platyhelminthes
D) Annelida
E) None of the listed responses is correct.
The Answer is : D
Q21.During typical earthworm reproduction __________. ( Concept 33.3)
A) B) C) D) E) hermaphroditic individuals exchange eggs
fertilization takes place during copulation between males and females
each individual fertilizes its own eggs with its own sperm (in self-fertilization)
hermaphroditic individuals exchange sperm
reproduction is by parthenogenesis, with no male participation
The Answer is : D
Q22.Leeches are members of the phylum __________ in the clade of bilaterally symmetric animals called
__________. ( Concept 33.3)
A) B) C) D) E) Nematoda ... Ecdysozoa
Annelida ... Lophotrochozoa
Platyhelminthes ... Deuterostomia
Cnidaria ... Lophotrochozoa
Arthropoda ... Deuterostomia
The Answer is : B
Q23.Which of the following groups has a true coelom, a lophophore, and no distinct head? ( Concept 33.3)
A) B) C) D) E) ectoprocts
sponges
flatworms
tapeworms
rotifers
The Answer is : A
Q24.An unidentified species of animal displays the following characteristics: bilateral symmetry, a complete
digestive system, an open circulatory system, distinct body segmentation, and a series of molting stages during
growth. To which of the following animal phyla does this species most likely belong? ( Concept 33.4)
A) B) C) D) E) The Answer is : E
Annelida
Platyhelminthes
Cnidaria
Nematoda
Arthropoda
Q25.The arthropods superficially resemble earthworms in that both groups __________, yet the two are
distinctly different because arthropods, but not earthworms, __________. ( Concept 33.4)
A) B) C) D) E) have closed circulatory systems ... have bristles
have a true coelom ... have an anus
are cephalized and bilaterally symmetrical ... have true organs
have prominently segmented bodies ... have jointed appendages
are acoelomates ... are segmented
The Answer is : D
Q26.A major characteristic of arthropods is __________. ( Concept 33.4)
A) B) C) D) E) a chitinous exoskeleton
radial symmetry
flame bulbs
a pseudocoelom
All of the listed responses are correct.
The Answer is : A
Q27.In most insects, gas exchange is accomplished by __________. ( Concept 33.4)
A) B) C) D) E) a tracheal system
diffusion across the exoskeleton
book lungs
lungs
flame bulbs
The Answer is : A
Q28.Sowbugs are really crustaceans, not insects. Therefore, a sowbug does NOT have __________. (
Concept 33.4)
A) B) C) D) E) The Answer is : E
jointed appendages
antennae
an exoskeleton
an open circulatory system
three pairs of legs
Q29.The majority of animal species are __________. ( Concept 33.4)
A) B) C) D) E) nematodes
insects
vertebrates
marine
acoelomates
The Answer is : B
Q30.In arthropods, molting is necessary because __________. ( Concept 33.4)
A) B) C) D) E) the environment degrades the exoskeleton, which therefore must be shed and replaced
worn exoskeletons make arthropods more susceptible to predators
the exoskeleton is progressively reabsorbed by body tissue
the chitinous exoskeleton cannot grow
arthropod appendages generally increase in number as the animal ages
The Answer is : D
Q31.Complete metamorphosis __________. ( Concept 33.4)
A) B) C) D) E) does not occur in wasps, bees, or ants
features a larval stage that looks different from the adult
is accompanied by a complete rearrangement of the genome
is the same thing as molting
involves adults that are specialized for eating and growth
The Answer is : B
Q32.Which of the following animals is most closely related to spiders? ( Concept 33.4)
A) B) C) D) E) pill bugs
scorpions
mosquitoes
grasshoppers
centipedes
The Answer is : B
Q33.The water vascular system of a sea star functions in __________. ( Concept 33.5)
A) B) C) D) E) The Answer is : D
reproduction
keeping all parts of the body moist at low tide
pumping water for swimming movements
movement of the tube feet
digestion
Q34.Which of the following statements about the phylum Echinodermata is true? ( Concept 33.5)
A) B) C) D) E) All possess a water vascular system, which permits movements via tube feet.
One of the clades in this phylum is Asteroidea, which includes the sea stars and sea daisies.
Many species possess an internal calcareous skeleton and spiny dermal projections.
Larval forms show evidence of bilateral symmetry, which is mostly lost in the adult form.
All of the listed responses are correct.
The Answer is : E
Q35.What is one visible feature that makes it easy to identify sea cucumbers as echinoderms? ( Concept 33.5)
A) B) C) D) E) They are elongated in the oral-aboral axis.
The endoskeleton is not reduced.
They have five rows of tube feet.
They have spines.
They move by serpentine lashing of their arms.
The Answer is : C
Q36.A land snail, a clam, and an octopus all share :
A) B) C) D) a mantle.
a radula.
gills.
distinct cephalization.
The Answer is : A
Q37.Which phylum is characterized by animals that have a segmented body?
A) B) C) D) Mollusca
Platyhelminthes
Cnidaria
Arthropoda
The Answer is : D
Q38.The water vascular system of echinoderms
A) B) C) D) The Answer is : C
functions as a circulatory system that distributes nutrients to body cells.
is bilateral in organization, even though the adult animal is not bilaterally symmetrical.
functions in locomotion and feeding.
moves water through the animal's body during suspension feeding.
Q39.Which of the following combinations of phylum and description is incorrect?
A) B) C) D) Nematoda—roundworms, pseudocoelomate
Platyhelminthes—flatworms, gastrovascular cavity, acoelomate
Echinodermata—bilateral symmetry as a larva, coelom present
Porifera—gastrovascular cavity, coelom present
The Answer is : D
Q40.In Figure 33.2, which two main clades branch from the most recent common ancestor of the eumetazoans?
A) B) C) D) The Answer is : A
Cnidaria and Bilateria
Porifera and Cnidaria
Lophotrochozoa and Ecdysozoa
Deuterostomia and Bilateria