Chapter 32: An Introduction to Animal Diversity


1 .       A graduate student finds an organism in a pond and thinks it is a freshwater sponge. A postdoctoral student thinks it looks more like an aquatic fungus. How can they decide whether it is an animal or a fungus? (Concept 32.1E-Book) [Hint]

 See if it reproduces sexually.
 Figure out whether it is autotrophic or heterotrophic.
 See if it is a eukaryote or prokaryote.
 Look for cell walls under a microscope.
 Determine whether it is unicellular or multicellular.

2 .       All animals can trace their lineage to a common ancestor that lived in the _____. (Concept 32.2E-Book) [Hint]

 Neoproterozoic era

3 .       Most animal body plans first appeared during the _____. (Concept 32.2E-Book) [Hint]


4 .       Which of the following is radially symmetrical? (Concept 32.2E-Book) [Hint]

 a doughnut
 an automobile
 a spoon
 a dog
 a submarine sandwich (aka hoagie, sub, grinder, bomber, etc.)

5 .       Gastrulation is the process that directly forms the _____. (Concept 32.3E-Book) [Hint]

 central nervous system
 primary germ layers

6 .       Which of the following is not a characteristic of all animals? (Concept 32.3E-Book) [Hint]

 They are all multicellular.
 They have tissues, organs, and organ systems.
 They are eukaryotes.
 They ingest their food.
 They are heterotrophic.

7 .       An important trend in animal evolution was cephalization. An animal is said to have advanced cephalization when it _____. (Concept 32.3E-Book) [Hint]

 is large
 has bilateral symmetry
 has an aggregation of sensory neurons at the anterior end
 has tissue specialization
 all of these

8 .       Which of the following animals does not have a body cavity? (Concept 32.3E-Book) [Hint]


9 .       During embryological development, the anus forms before the mouth in _____. (Concept 32.3E-Book) [Hint]


10 .       An animal is called a protostome or a deuterostome based on _____. (Concept 32.3E-Book) [Hint]

 whether it has a blastocoel
 the number of germ layers it has
 the fate of its blastopore
 the symmetry of its gastrula
 all of these

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