Name Class Date Skills Worksheet Echinoderms and Invertebrate Chordates Write the correct term from the list below in the space next to its definition. atriopore ossicles tube foot echinoderm test water-vascular system _______________________ 1. opening by which water leaves the body of a lancelet _______________________ 2. extension of the water-vascular system that aids movement _______________________ 3. group of invertebrates that includes sea stars, sand dollars, sea urchins, and sea cucumbers _______________________ 4. calcium-rich plates that make up the endoskeleton of an echinoderm _______________________ 5. a water-filled system of interconnected canals and thousands of tiny, hollow tube feet _______________________ 6. fused, rigid endoskeleton In the space provided, write the letter of the description that best matches the term or phrase. ______ 7. pedicellaria a. contracts and forces water into the tube feet ______ 8. radial canal b. bilaterally symmetrical larva ______ 9. ampulla c. keeps the body free of foreign objects ______10. bipinnaria d. carries water directly to the tube feet Copyright © by Holt, Rinehart and Winston. All rights reserved. Modern Biology 75 Vocabulary Review Name Class Date Assessment Echinoderms and Invertebrate Chordates In the space provided, write the letter of the description that best matches the term or phrase. ______ 1. madreporite a. a chordate that lacks a nerve cord as an adult ______ 2. tunicate b. an armless echinoderm with protruding ______ 3. incurrent siphon spines c. an armless echinoderm with a soft, ______ postanal tail 4. sluglike body ______ 5. sea cucumber d. the structure through which water enters a tunicate’s body ______ 6. sea urchin e. a structure that extends beyond the anus f. the structure through which water enters and leaves the water-vascular system In the space provided, write the letter of the term or phrase that best completes each statement or best answers each question. ______ 7. Most adult echinoderms have which of the following? a. an asymmetrical body b. five-part radial symmetry c. five-part bilateral symmetry d. two-part bilateral symmetry ______ 8. Sea lilies and feather stars differ from all other living echinoderms because their mouth a. develops from the blastopore. b. is disk-shaped. c. is located on the lower surface. d. is located on the upper surface. ______ 9. Which of the following is a sessile chordate? a. sea star c. lancelet b. tunicate d. sand dollar ______10. Animals that have a notochord but do NOT have a backbone are called a. protostomes. c. vertebrates. b. echinoderms. d. invertebrate chordates. Copyright © by Holt, Rinehart and Winston. All rights reserved. Modern Biology 75 Quiz.