1. A CTIVE L ECTURES Using Classroom Response Systems Copyright © 2008 Pearson Prentice Hall, Inc. Chapter 23: Animal Diversity 1: Invertebrates

2. In general, which of the following does not describe an animal? 1.Multicellular 2.Ingests nutrients 3.Autotroph 4.Heterotroph 5.Reproduces sexually 6.Motile at some point during life 7.Lacks cell walls 8.Responds rapidly to stimuli

3. In general, which of the following does not describe an animal? 1.Multicellular 2.Ingests nutrients 3.Autotroph 4.Heterotroph 5.Reproduces sexually 6.Motile at some point during life 7.Lacks cell walls 8.Responds rapidly to stimuli

4. Which of the following would be useless for determining whether a horse is more related to a pig or a human? 1.Comparison of homologous structures 2.Comparison of vestigial structures 3.Comparison of analagous structures 4.Comparison of strands of DNA 5.Comparison of early embryological development

5. Which of the following would be useless for determining whether a horse is more related to a pig or a human? 1.Comparison of homologous structures 2.Comparison of vestigial structures 3.Comparison of analagous structures 4.Comparison of strands of DNA 5.Comparison of early embryological development

6. How are sponges different from other animals? 1.Sponges do not move at any point in their life. 2.Sponges do not have tissue-level organization. 3.Sponges are the only unicellular animals. 4.Sponges can undergo photosynthesis and are autotrophs.

7. Question 23-3

9. How are sponges different from other animals? 1.Sponges do not move at any point in their life. 2.Sponges do not have tissue-level organization. 3.Sponges are the only unicellular animals. 4.Sponges can undergo photosynthesis and are autotrophs.

10. What type of symmetry do these animals have? 1.No symmetry 2.Radial symmetry 3.Bilateral symmetry

11. What type of symmetry do these animals have? 1.No symmetry 2.Radial symmetry 3.Bilateral symmetry

12. Question 23-4

13. What type of symmetry does this animal have? 1.No symmetry 2.Radial symmetry 3.Bilateral symmetry

14. What type of symmetry does this animal have? 1.No symmetry 2.Radial symmetry 3.Bilateral symmetry

15. Question 23-5

16. If you came across an unidentified animal, it would most likely be: 1.A protist. 2.A fungus. 3.An invertebrate. 4.A vertebrate.

17. If you came across an unidentified animal, it would most likely be: 1.A protist. 2.A fungus. 3.An invertebrate. 4.A vertebrate.

18. Question 23-8

19. A flatworm has no internal body cavity separating the gut and the body wall. The flatworm is: 1.A pseudocoelomate. 2.An acoelomate. 3.A coelomate. 4.A procoelomate.

20. A flatworm has no internal body cavity separating the gut and the body wall. The flatworm is: 1.A pseudocoelomate. 2.An acoelomate. 3.A coelomate. 4.A procoelomate.

21. Question 23-9

22. What distinguishes cnidarians from other animals? 1.Cnidarians have no symmetry. 2.Cnidarians alternate between haploid and diploid generations. 3.Cnidarians live strictly in watery environments. 4.Cnidarians have cnidocytes, stinging cells that eject poisonous filaments into prey. 5.Cnidarians reproduce asexually and sexually.

23. Question 23-11

25. What distinguishes cnidarians from other animals? 1.Cnidarians have no symmetry. 2.Cnidarians alternate between haploid and diploid generations. 3.Cnidarians live strictly in watery environments. 4.Cnidarians have cnidocytes, stinging cells that eject poisonous filaments into prey. 5.Cnidarians reproduce asexually and sexually.

26. Question 23-11

27. Why would it be beneficial for a parasitic flatworm to be hermaphroditic? 1.To be able to reproduce if no other flatworms are around with which to mate 2.To be able to reproduce asexually when conditions are not favorable 3.To be able to exist at only the tissue level of organization 4.To be able to poison its host

28. Question 23-12

29. Why would it be beneficial for a parasitic flatworm to be hermaphroditic? 1.To be able to reproduce if no other flatworms are around with which to mate 2.To be able to reproduce asexually when conditions are not favorable 3.To be able to exist at only the tissue level of organization 4.To be able to poison its host

30. Have you ever been infected with a roundworm? 1.Yes. 2.No.

31. Question 23-20