CLICKER QUESTIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson Chapter 33 An Introduction to Invertebrates Click to edit Master title style Click to edit Master subtitle style 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 changes? 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 appendages © 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 segmentation b) changes in regulation of Hox genes for body segmentation c) increased number of Hox genes for appendages d) changes in regulation of Hox genes for appendages e) increased complexity in genes for exoskeleton arrangements © 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 substances. 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.