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Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Chapter 33
An Introduction to Invertebrates
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Questions prepared by
Ruth Buskirk
University of Texas at Austin
Michael Dini
Texas Tech University
© 2011 Pearson Education, Inc.
Why do sponges represent a separate lineage,
distinct from all other animal phyla?
a) They are sedentary and resemble plants.
b) Most individuals are hermaphrodites.
c) They do not have specialized cell types.
d) They have only two layers of cells.
e) They lack true tissues.
© 2011 Pearson Education, Inc.
Cnidaria includes groups with a variety of body
forms, but all share which common feature?
a) All are filter feeders.
b) All are strong swimmers.
c) All have a gastrovascular cavity and tentacles.
d) All live in tropical oceans.
e) All reproduce mainly asexually.
© 2011 Pearson Education, Inc.
The group known as Lophotrochozoa includes
about 18 animal phyla and has a huge diversity of
body forms. On what basis are all these animals
thought to be in the same clade?
a) DNA sequences
b) embryo structure
c) body cavity
d) type of skeleton
e) arrangement of appendages
© 2011 Pearson Education, Inc.
Among flatworms that are internal parasites,
which of the following would be expected?
a) light-sensitive eyes
b) prolific asexual reproduction in a vertebrate host
c) limited to microscopic size
d) suckers or piercing mouthparts
© 2011 Pearson Education, Inc.
The clam, snail, and octopus are all molluscs.
The muscular foot of a snail is homologous to
(i.e., derived from the same structure as) which
one of these?
a) head of the octopus
b) shell of the clam
c) legs of the octopus
d) siphon tube of the clam
e) mantle of the clam
© 2011 Pearson Education, Inc.
The evolutionary origin of extensive complexity
in arthropod body plans is thought to be
associated with which of these morphological
a) the origin of a chitinous exoskeleton
b) the origin of numerous appendages
c) the specialization of diverse body segments
d) the addition of numerous identical body segments
e) the fusion of body segments and reduction of
© 2011 Pearson Education, Inc.
Which of these genetic changes is thought to
have led to the increasing complexity of the
arthropod body plan?
a) increased number of Hox genes for body
b) changes in regulation of Hox genes for body
c) increased number of Hox genes for appendages
d) changes in regulation of Hox genes for appendages
e) increased complexity in genes for exoskeleton
© 2011 Pearson Education, Inc.
Free-living flatworms, roundworms, and
segmented worms share all of the following
traits except
a) bilateral symmetry.
b) three embryonic tissue layers.
c) presence of a digestive system.
d) digestive tract with mouth and anus.
e) muscle tissue and a hydrostatic skeleton.
© 2011 Pearson Education, Inc.
All of the following were important contributions
to the large adaptive diversity of insects except
a) diverse mouthparts for feeding on different
b) multiple origins of wings in different insect groups.
c) expansion of flowering plant diversity.
d) invasion of many terrestrial habitats by insects.
e) diverse reproductive and social behaviors.
© 2011 Pearson Education, Inc.
In addition to similarities in their molecular
DNA, the phyla Echinodermata (including sea
stars) and Chordata (including the vertebrates)
share all of these except
a) bilateral symmetry as adult animals.
b) an endoskeleton.
c) their means of locomotion.
d) deuterostome development.
e) a true coelom.
© 2011 Pearson Education, Inc.
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