Practice Test Ch 33: An Introduction to Invertebrates Flashcards
Sponges feed by __________. (Concept 33.1)
a. performing photosynthesis
b. paralyzing small crustaceans with stinging cells
c. filtering small particles from water
d. absorbing nutrients from the guts of their hosts
e. scraping bacteria and algae from hard substrates
c. Sponges trap food from the water circulating through their porous bodies.
a. X
Some sponges do harbor photosynthetic endosymbionts, but they still obtain the bulk of their nutrition from suspension feeding.
b. X
Sponges do not have paralyzing structures.
d. X
Sponges are not endoparasites.
e. X
Sponges lack the anatomy to do this.
Sponges lack __________. (Concept 33.1)
a. tissues
b. the ability to make organic compounds from CO2 and water
c. a complete digestive tract
d. a nervous system
e. all of the listed responses are correct
e. Sponges have no nerves or muscles, and they are suspension feeders that trap food from water circulated through their porous bodies.
a. X
This statement is true, but there is a better response.
b. X
This statement is true, but there is a better response.
c. X
This statement is true, but there is a better response.
d. X
This statement is true, but there is a better response.
Some digestion in sponges takes place in the __________. (Concept 33.1)
a. osculum
b. spongocoel
c. gastrointestinal tract
d. amoebocytes
e. gastrovascular cavity
d. Amoebocytes digest the food that sponges pick up from water and from choanocytes.
a. X
Water that has been drawn into a sponge’s central cavity exits via the osculum.
b. X
The spongocoel is the central cavity of a sponge into which water flows and from which food is captured. However, food is not digested here.
c. X
Sponges do not have a gastrointestinal tract.
e. X
Sponges do not have a gastrovascular cavity.
Which of the following is/are characteristic of sponges? (Concept 33.1)
a. They consist of two layers of cells with a noncellular gelatinous layer between them.
b. They have collar cells.
c. They have holes, or pores, in specialized cells, through which water enters.
d. All of the listed responses are correct.
e. None of the listed responses are correct.
d. These are all characteristics of sponges.
a. X
This statement is true, but there is a better response.
b. X
This statement is true, but there is a better response.
c. X
This statement is true, but there is a better response.
e. X
At least one of the traits listed is characteristic of sponges.
Which of the following features is characteristic of the poriferan (sponge) body plan or life history? (Concept 33.1)
a. extracellular digestion
b. specialized respiratory surfaces
c. motile larvae
d. closed circulatory system
e. ventral nerve chord
c. Zygotes develop into flagellated, swimming larvae that disperse from the parent.
a. X
Sponges lack a cavity in which digestion could take place.
b. X
Sponges do not exhibit this degree of complexity.
d. X
Sponges do not exhibit this degree of complexity.
e. X
Sponges do not exhibit this degree of complexity.
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. embryo
b. polyp
c. medusa
d. larva
e. mesoglea
b. Sessile polyps are cylindrical forms that attach to a substratum and extend their tentacles, waiting for prey.
a. X
This is neither the motile nor the sessile stage referred to in this question.
c. X
The medusa is not an attached form.
d. X
The larva is not an attached form.
e. X
This is a part of a cnidarian’s body.
Through what means do coral animals capture their food? (Concept 33.2)
a. tentacles that trap food particles
b. teeth that shred prey
c. filter feeding
d. dinoflagellates (photosynthetic protists that live in the coral’s tissues)
e. absorption of predigested food from their prey
a. Coral animals, like all cnidarians, have tentacles armed with batteries of stinging cells called cnidocytes. They use those tentacles to capture prey and push food into the gastrovascular cavity.
a. X
Coral animals lack teeth.
b. X
All cnidarians, including coral, are predators.
d. X
However, some corals do harbor photosynthetic endosymbionts.
e. X
Corals do not have this ability.
__________ are members of the phylum __________ and feed by __________. (Concept 33.2)
a. Rotifers; Arthropoda; a lophophore
b. Sea anemones; Cnidaria; using stinging cells to capture small animals that venture too close to them
c. Sponges; Urochordata; scraping away organic films covering the rocks on which they grow
d. Bivalves; Annelida; killing small animals with electric shock
e. Leeches; Porifera; filtering tiny particles from water passing through their bodies
b. Cnidaria, including sea anemones, have tentacles armed with cnidocytes, unique stinging cells that function in defense and in the capture of prey.
a. X
One of the other choices is correct.
c. X
Urochordates are a chordate subphylum.
d. X
Bivalves are molluscan suspension feeders.
e. X
Leeches are not a type of sponge.
The choanocyte of a sponge and the nematocyst of a cnidarian both function in __________. (Concept 33.2)
a. obtaining food
b. locating mates
c. sight
d. reproduction
e. locomotion
a. Lining the inside of a spongocoel are flagellated choanocytes, which trap food particles. Nematocysts are stinging capsules that function in defense and in the capture of prey.
a. X
Lining the inside of a spongocoel are flagellated choanocytes, which trap food particles. Nematocysts are stinging capsules that function in defense and in the capture of prey.
b. X
Neither of these types of animals can “see.” Lining the inside of a spongocoel are flagellated choanocytes, which trap food particles. Nematocysts are stinging capsules that function in defense and in the capture of prey.
d. X
Lining the inside of a spongocoel are flagellated choanocytes, which trap food particles. Nematocysts are stinging capsules that function in defense and in the capture of prey.
e. X
Lining the inside of a spongocoel are flagellated choanocytes, which trap food particles. Nematocysts are stinging capsules that function in defense and in the capture of prey.
Which of the following is true about the phylum Cnidaria? (Concept 33.2)
a. The bodies of its members are organized around a gastrovascular cavity.
b. All cnidarians except corals are in the medusa stage.
c. The bodies of cnidarians are bilaterally symmetrical and show cephalization.
d. This phylum has more species than any other phylum.
e. All of the listed responses are correct.
a. This statement does describe the phylum Cnidaria.
Question
b. X
The life cycles of many cnidarians alternate between a feeding polyp and a reproductive medusa.
c. X
The bodies of cnidarians are radially symmetrical and show no cephalization.
d. X
The phylum Arthropoda has more species than any other phylum.
e. X
Only one of the statements is correct.
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. Phylum Platyhelminthes
b. Phylum Mollusca
c. Phylum Nematoda
d. Phylum Arthropoda
e. Phylum Annelida
a. Tapeworms are platyhelminths.
b. X
Tapeworms are not molluscs.
c. X
Tapeworms are not nematodes.
d. X
Tapeworms are not arthropods.
e. X
Tapeworms are not annelids.
Which of the following groups of worms is/are completely parasitic? (Concept 33.3)
a. Trematodes
b. Rhabditophorans
c. Platyhelminths
d. Catenulids
e. All of the listed responses are correct
a. Trematodes are parasitic rhabditophorans within the phylum Platyhelminthes (flatworms).
b. X
Not all rhabditophorans are parasites, although more than half of the species are parasitic.
c. X
Only some platyhelminths (found in the clade called Rhabditophora) are parasitic.
d. X
Catenulids are freshwater free-living flatworms.
e. X
Only one of the choices is completely parasitic.
The proglottids of a tapeworm contain an elaborate __________ system. (Concept 33.3)
a. reproductive
b. sensory
c. attachment
d. digestive
e. circulatory
a. Posterior to the head, or scolex, is a long ribbon of units called proglottids, which are little more than sacs of sex organs.
b. X
Proglottids are sacs of sex organs.
c. X
The scolex plays a role in attachment.
d. X
Tapeworms do not have a digestive system.
e. X
Tapeworms do not have a circulatory system.
Some species of rotifers undergo parthenogenesis, which means that __________. (Concept 33.3)
a. X
b. X
d. X
e. X
