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

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

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

4. What group of animals has more biomass than any other animal group on Earth? 1.Cephalopods 2.Cnidarians 3.Annelids 4.Arthropods 5.Sponges 6.Platyhelminthes

5. What group of animals has more biomass than any other animal group on Earth? 1.Cephalopods 2.Cnidarians 3.Annelids 4.Arthropods 5.Sponges 6.Platyhelminthes

6. Question 23-14

7. How do arthropods grow while being contained in an exoskeleton, which is a rigid, heavy structure? 1.Arthropods die when they grow too large for their exoskeleton. 2.Arthropods molt or shed their exoskeleton and replace it with a bigger one. 3.Arthropods leave their exoskeletons and find a larger, more suitable one left by another arthropod. 4.Arthropods grow no larger than the size of their exoskeleton.

8. How do arthropods grow while being contained in an exoskeleton, which is a rigid, heavy structure? 1.Arthropods die when they grow too large for their exoskeleton. 2.Arthropods molt or shed their exoskeleton and replace it with a bigger one. 3.Arthropods leave their exoskeletons and find a larger, more suitable one left by another arthropod. 4.Arthropods grow no larger than the size of their exoskeleton.

9. Metamorphosis enables insects: 1.To be able to alternate between diploid and haploid generations. 2.To avoid expending the energy required to build an exoskeleton as a juvenile. 3.To hide from predators as juveniles. 4.To lessen the competition for food sources between the juveniles and the adults.

10. Metamorphosis enables insects: 1.To be able to alternate between diploid and haploid generations. 2.To avoid expending the energy required to build an exoskeleton as a juvenile. 3.To hide from predators as juveniles. 4.To lessen the competition for food sources between the juveniles and the adults.

11. Spiders are insects. 1.True. 2.False.

12. Question 23-17

13. Spiders are insects. 1.True. 2.False.

14. Why is a horseshoe crab an arachnid and not a crustacean? 1.The horseshoe crab has ten walking legs. 2.The horseshoe crab does not have antennae. 3.The horseshoe crab is carnivorous. 4.The horseshoe crab has an exoskeleton.

15. Why is a horseshoe crab an arachnid and not a crustacean? 1.The horseshoe crab has ten walking legs. 2.The horseshoe crab does not have antennae. 3.The horseshoe crab is carnivorous. 4.The horseshoe crab has an exoskeleton.

16. Among myriapods, what differentiates a millipede from a centipede? 1.Millipedes have more eyes. 2.Centipedes have more eyes. 3.Millipedes have more legs. 4.Centipedes have more legs.

17. Question 23-19

19. Among myriapods, what differentiates a millipede from a centipede? 1.Millipedes have more eyes. 2.Centipedes have more eyes. 3.Millipedes have more legs. 4.Centipedes have more legs.