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1. Which of the following is not a characteristic of most members of the phylum
Annelida?
a. hydrostatic skeleton
b. segmentation
c. pseudocoelom
d. closed circulatory system
e. all of the above are characteristics of Annelida
2. Which phylum is characterized by animals that have a segmented body?
a. Cnidaria
b. Platyhelminthes
c. Porifera
d. Arthropoda
e. Mollusca
3. Which of the following characteristics is responsible for the incredible diversification
and success of insects on land?
a. Segmentation
b. Specialized mouth parts
c. Metamorphosis
d. Flight
e. All of the above
4. Which of the following combinations of phylum and description is incorrect?
a. Nematoda-roundworms, pseudocoelomate
b. Cnidaria-radial symmetry, polyp and medusa body forms
c. Platyhelminthes-flatworms, gastrovascular cavity, acoelomate
d. Porifera-gastrovascular cavity, coelom present
5. Which of these statements is true of sponges?
a. They have an open circulatory system.
b. They are segmented animals.
c. They have no true tissues.
d. They are pseudocoelomates.
6. Which of these statements is true of cnidarians?
a. They have radial symmetry.
b. They have three tissue layers (they are triploblastic)
c. They have a complete digestive system.
d. They are segmented.
e. They have an exoskeleton composed of chitin.
7. Of the phyla studied in this exercise, the one that has three tissue layers is the phylum
_____.
a. Cnidaria
b. Porifera
c. Platyhelminthes
d. None of the above
8. Which of these statements is true of nematodes?
a. They lack a skeleton.
b. They lack a body cavity.
c. They have a digestive system with two openings.
d. Their body plan has two main tissue layers.
e. They are segmented.
9. Earthworms are in the phylum _____.
a. Nematoda
b. Annelida
c. Platyhelminthes
d. Arthropoda
10. Which of these statements is true of earthworms?
a. They have a body cavity.
b. They have a bony skeleton.
c. Their body plan consists of two tissue layers.
11. Snails are classified in the phylum _____.
a. Chordata
b. Mollusca
c. Cnidaria
d. Arthropoda
12. Which of these characteristics is common to both Mollusca and Annelida?
a. an open circulatory system
b. segmentation
c. two tissue layers
d. an exoskeleton
e. bilateral symmetry
13. Grasshoppers are classified in the phylum _____.
a. Annelida
b. Mollusca
c. Nematoda
d. Arthropoda
14. Animals in Cnidaria _____.
a. exhibit bilateral symmetry
b. exhibit radial symmetry
c. exhibit no symmetry
d. lack a digestive system
15. Sponges feed by _____.
a. filtering small particles from water
b. scraping bacteria and algae from hard substrates
c. paralyzing small crustaceans with stinging cells
d. absorbing nutrients from the guts of their hosts
e. performing photosynthesis
16. Sponges lack _____.
a. a complete digestive tract
b. germ layers
c. true tissues
d. all of the above
17. Which characteristic is not true of sponges?
a. They have collar cells.
b. They have holes, or pores, in specialized cells, through which water enters.
c. They generally show no regular symmetrical pattern.
d. All of the above are characteristics of sponges.
18. Some cnidarians go through both a motile and a sessile (attached) stage during their
life cycle. The attached stage is called a(n) _____.
a. embryo
b. medusa
c. larva
d. polyp
19. The choanocyte of a sponge and the nematocyst (of a cnidocyte) of a cnidarian both
function in _____.
a. reproduction
b. locomotion
c. obtaining food
d. locating mates
e. sight
20. Which of the following statements does not describe the phylum Cnidaria?
a. The bodies of its members have a gastrovascular cavity.
b. This phylum has more species than any other phylum.
c. The life cycles of many of its members alternate between a feeding polyp and a
reproductive medusa.
d. The bodies of its members are radially symmetrical and show no cephalization.
e. All of these statements describe the phylum Cnidaria.
21. Tapeworms are highly specialized worms that make their living as endoparasites. To
which of the following phyla and classes do the tapeworms belong?
a. phylum Annelida
b. phylum Nematoda
c. phylum Platyhelminthes
22. Which of the following classes is (are) totally parasitic?
a. Cestoidea
b. Turbellaria
c. Trematoda
d. Cestoidea and Trematoda
e. all of the above
23. 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 animal classes does this organism most likely belong?
a. Chelicerata
b. Crustacea
c. Cephalopoda
d. Bivalvia
24. Cephalopods are the only molluscs _____.
a. without a mantle
b. with a closed circulatory system
c. with segmented bodies
d. that are hermaphrodites
25. Annelids _____.
a. include earthworms
b. have characteristically long bodies with segmentation
c. use their coeloms as hydrostatic skeletons
d. have a mouth that is separate from the anus.
e. all of the above
26. Which choice includes three different phyla of organisms commonly known as
"worms"?
a. Nematoda, Mollusca, Platyhelminthes
b. Cnidaria, Arthropoda, Porifera
c. Platyhelminthes, Annelida, Nematoda
d. Nematoda, Arthropoda, Platyhelminthes
e. Mollusca, Porifera, Platyhelminthes
27. Animals such as _____ are the simplest animals to have _____.
a. sponges ... bilateral symmetry
b. flatworms ... a body cavity
c. jellies ... a complete digestive tract
28. An unidentified species of animal displays the following characteristics: bilateral
symmetry, determinate embryonic cleavage, a complete digestive system, an open
circulatory system, and distinct body segmentation. To which one of the following animal
phyla does this species most likely belong?
a. Cnidaria
b. Platyhelminthes
c. Porifera
d. Annelida
e. Arthropoda
29. The arthropods superficially resemble earthworms in that both groups _____, yet the
two are distinctly different because arthropods, but not earthworms, _____.
a. have prominently segmented bodies ... have jointed appendages
b. have closed circulatory systems ... have bristles
c. are cephalized and bilaterally symmetrical ... create casts in the dirt
d. have a true coelom ... are protostomes
e. are acoelomates ... are segmented
30. The majority of animal species are _____.
a. insects
b. deuterostomes
c. marine
d. acoelomates
e. vertebrates
Answers:
1. e
2. d
3. e
4. d
5. c
6. a
7. c
8. c
9. b
10. a
11. b
12. e
13. d
14. b
15. a
16. d
17. d
18. d
19. c
20. b
21. c
22. d
23. c
24. b
25. e
26. c
27. b
28. e
29. a
30. a