test 1

Question 1

Which phylum has a body plan characterized by a highly branched, saclike gut, and a thin, flat body with all cells fairly close to the gut (acoelomate)?
a. Platyhelminthes
b. Nematoda
c. Echinodermata
d. Cnidaria

Answer 1

Platyhelminthes

Question 2

Platyhelminths:
a. are acoelomate.
b. are coelomate.
c. are placomate.
d. are pseudocoelomate.

Answer 2

Acoelomate

Question 3

The first known animal is considered to be a
a. Porifera.
b. Nematoda.
c. Platyhelminthes.
d. Placozoan

Answer 3

porifera

Question 4

Which of the following is NOT a characteristic of the Cnidaria?
a. pharynx
b. mesoglea
c. nematocysts
d. polyp form

Answer 4

pharynx

Question 5

The terms “acoelomate,” “pseudocoelomate,” and “coelomate” refer to
a. levels of cephalization.
b. the origin of the blastopore.
c. the body cavity of animals.
d. cleavage patterns of animals.

Answer 5

the body cavity of animals

Question 6

Which of the following is an INCORRECT statement about the Cnidaria digestive system.
a. Digestive enzymes are secreted to break-down food.
b. It is complete, possessing a mouth and an anus.
c. The digestive tissue is the gastrodermis.
d. None of the above are incorrect statements about the Cnidaria digestive system.

Answer 6

It is complete, possessing a mouth and an anus.

Question 7

Which of the following phyla is characterized by radially symmetrical members?
a. Arthropoda
b. Mollusca
c. Cnidaria
d. Platyhelminthes

Answer 7

Cnidaria

Question 8

Periodic molting of the insect exoskeleton is necessary because
a. an insect must consume large amounts of food to support the growth of the exoskeleton.
b. the growth of the exoskeleton is not sufficient to accommodate the body growing inside it.
c. it prevents an insect from moving rapidly.
d. it attracts predators.

Answer 8

the growth of the exoskeleton is not sufficient to accommodate the body growing inside it.

Question 9

Evidence for the evolutionary link between choanoflagellate protists colonies and animals is most clearly seen in
a. Echinodermata.
b. Cnidaria.
c. Mammalia.
d. Porifera.

Answer 9

porifera

Question 10

An organism that possesses a scolex and proglottids is found in the class
a. Turbellaria.
b. Cestoda.
c. Platyhelminthes.
d. Trematoda.

Answer 10

cestoda

Question 11

Which of the following groups does NOT have tissues?
a. Echinodermata
b. Cnidaria
c. Nematoda
d. Porifera

Answer 11

porifera

Question 12

Pseudocoelomates have a body cavity that is not completely lined with ____________. These animals include ____________.
a. ectoderm; Porifera
b. membranes; Platyhelminthes
c. ectoderm; Cnidaria
d. membranes; Nematoda

Answer 12

membranes; Nematoda

Question 13

Exoskeletons are most characteristic of which of the following?
a. Echinodermata
b. Mollusca
c. Arthropoda
d. Chordata

Answer 13

Arthropoda

Question 14

The type of symmetry exhibited by the Cnidaria is known as _______ symmetry.
a. radial
b. asymmetrical
c. spherical
d. bilateral

Answer 14

radial

Question 15

Which statement most accurately describes the colonial flagellate hypothesis?
a. Animals are descended from an ancestor that resembles a spherical colony of flagellated cells.
b. Both animals and fungi are descended from an ancestor that resembles a spherical colony of flagellated cells.
c. All animals are descended from an ancestor that resembles a single celled organism that was a flagellated cell.
d. None of these describe the colonial flagellate hypothesis.

Answer 15

Animals are descended from an ancestor that resembles a spherical colony of flagellated cells

Question 16

Annelidia:
a. surround their body with a mantle.
b. have a segmented body
c. move with a muscular foot.
d. have a visceral mass.

Answer 16

have a segmented body

Question 17

A mantle is found only among the
a. Echinodermata.
b. Mollusca.
c. Arthropoda.
d. Annelidia.

Answer 17

mollusca

Question 18

The gelatinous matrix in the body of the Porifera is called
a. mesoderm.
b. mesoglea.
c. mesowhat.
d. mesochyme.

Answer 18

mesochyme

Question 20

The individual, repeating units of a Cestoda are called
a. nematocysts.
b. proglottids.
c. oral suckers.
d. scolexs.

Answer 20

proglottids

Question 21

The segments of a Cestoda that contain female and male sex organs are called
a. sporocysts.
b. scolexes.
c. proglottids.
d. cercariae.

Answer 21

proglottids

Question 22

The major Arthropoda body parts are
a. head, thorax, and abdomen.
b. head, carapace, and abdomen.
c. cephalothorax, midsection, and abdomen.
d. head, prothorax, and metathorax.

Answer 22

head, thorax, and abdomen.

Question 23

Porifera are
a. filter feeders.
b. scavengers.
c. predators.
d. herbivores.

Answer 23

filter feeders

Question 24

The trend toward cephalization is first seen in the:
a. Porifera.
b. Cnidaria.
c. Platyhelminthes.
d. Nematoda.

Answer 24

Platyhelminthes

Question 25

Molting in Arthropoda involves primarily a change in a. eating habits. b. sensory structures. c. sex. d. body size.

Answer 25

body size

Question 26

Major trends in the evolution of animals include a. variation in coelomic (body) cavities. b. the development of segments. c. the development of different types of symmetry. d. All the above.

Answer 26

All the above

Question 27

The ancestor of the animal clade was probably a(n) a. triploblastic acoelomate with spiral cleavage. b. ctenophore. c. ciliated protist. d. colonial flagellated protist.

Answer 27

colonial flagellated protist

Question 28

Which of the following phyla exhibit an unlined body cavity (pseudocoelom)? a. Cnidaria b. Platyhelminthes c. Porifera. d. Nematoda.

Answer 28

Nematoda

Question 29

Because all animals must take in nutrients from their environment and digest their food internally, the term applied to the nutritional mode of animals is a. phagocytic. b. photoautotrophic. c. heterotrophic. d. photoheterotrophic.

Answer 29

heterotrophic

Question 30

A digestive tract is said to be complete if it AT LEAST a. possesses specialized regions for different digestive tasks. b. produces acids and contains enzymes. c. is a one-way tube with a mouth and an anus. d. is surrounded by muscle.

Answer 30

is a one-way tube with a mouth and an anus.

Question 31

Which of the following is NOT a characteristic of all animals? a. Animals are multicellular eukaryotes. b. Animals produce gametes by meiosis. c. Animals digest their food internally. d. All the above are characteristics of animals.

Answer 31

All the above are characteristics of animals.

Question 32

Which animal belongs in the Crustacea? a. mite b. spider c. tick d. shrimp

Answer 32

shrimp

Question 33

Cephalization is most commonly associated with a. sessile animals. b. pentaradial symmetry. c. bilateral symmetry d. radial symmetry.

Answer 33

bilateral symmetry

Question 34

Which of the following is NOT a characteristic of the Mollusca? a. head and foot b. carapace c. mantle d. gills

Answer 34

carapace

Question 35

All animals are a. multicellular, autotrophic, and haploid b. multicellular, heterotrophic, and haploid. c. multicellular, heterotrophic, and diploid. d. multicellular, autotrophic, and diploid.

Answer 35

multicellular, heterotrophic, and diploid.

Question 36

Which of the following is NOT a characteristic of Arthropoda? a. open circulatory system b. segmentation c. jointed appendages d. setae

Answer 36

setae

Question 37

Porifera differ from other animals in that they a. are heterotrophic.. b. None of the options. c. do not form true organs. d. are sessile.

Answer 37

do not form true organs