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Name ______________________________ Class ___________________ Date __________________ SECTION 35-1 REVIEW MOLLUSCA VOCABULARY REVIEW Explain the relationship between the terms in each of the following pairs of terms. 1. visceral mass, mantle ______________________________________________ _______________________________________________________________ _______________________________________________________________ 2. hemolymph, hemocoel ____________________________________________ _______________________________________________________________ _______________________________________________________________ 3. incurrent siphon, excurrent siphon ___________________________________ _______________________________________________________________ _______________________________________________________________ MULTIPLE CHOICE Write the correct letter in the blank. _____ 1. One advantage of a coelom over a pseudocoelom is that a coelom a. b. c. d. contains fluid while a pseudocoelom does not. is completely surrounded by endoderm. eliminates the need for a circulatory system. allows body wall muscles to contract without hindering digestion. _____ 2. One feature that is shared by many mollusks and annelids is the a. radula. b. mantle cavity. c. trochophore. d. pseudopodium. _____ 3. Mollusks in the class Gastropoda a. lack a distinct head. c. do not have a hemocoel. b. have an open circulatory system. d. are usually sessile. _____ 4. Bivalves have all of the following structures except a. a radula. b. adductor muscles. c. siphons. d. gills. _____ 5. An octopus generally moves by a. b. c. d. pumping a jet of water through its incurrent siphon. crawling along the bottom with its tentacles. gliding on a layer of mucus with the help of cilia. repeatedly opening its valves and snapping them shut. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Modern Biology 191 Mollusca Name ______________________________ Class ___________________ Date __________________ SHORT ANSWER Answer the questions in the space provided. 1. Identify the two main regions of a typical mollusk’s body. _______________________ _______________________________________________________________ Which region contains most of the internal organs? _____________________ Which region is directly involved with locomotion? _____________________ 2. What is the usual function of the mantle in a snail or clam? _______________________ _______________________________________________________________ 3. Contrast the feeding methods of gastropods and bivalves. _______________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 4. Contrast sexual reproduction of marine clams and most freshwater clams. _______________________ _______________________________________________________________ _______________________________________________________________ 5. Critical Thinking A cephalopod called the paper nautilus makes a type of shell with its foot. This shell, which consists largely of protein, is formed only by the female and is used to protect the eggs. List four reasons why this shell is not a typical molluskan shell. _______________________ _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ STRUCTURES AND FUNCTIONS Identify the structures labeled a–h in the diagram of the basic body plan of a mollusk shown below. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Modern Biology 192 Mollusca Name ______________________________ Class ___________________ Date __________________ SECTION 35-2 REVIEW ANNELIDA VOCABULARY REVIEW Define the following terms. 1. seta ____________________________________________________________ _______________________________________________________________ 2. parapodium _____________________________________________________ _______________________________________________________________ 3. typhlosole ______________________________________________________ _______________________________________________________________ 4. nephridium______________________________________________________ _______________________________________________________________ MULTIPLE CHOICE Write the correct letter in the blank. _____ 1. Segmentation is an advantage for annelid worms because it a. b. c. d. requires the whole body to move as a single unit. reduces the number of setae on the parapodia. divides the pseudocoelom into multiple compartments. is accompanied by the duplication of some internal organs. _____ 2. Contraction of an earthworm’s longitudinal muscles a. pushes the anterior end forward. c. pulls the posterior end forward. b. pulls the anterior end backward. d. pushes the posterior end backward. _____ 3. An earthworm uses its setae to a. grip the soil surface. c. contract in a longitudinal direction. b. contract in a circular direction. d. form a protective case for its eggs. _____ 4. One difference between leeches and polychaetes is that leeches a. do not have segments. b. do not have setae. c. have parapodia. d. are never carnivorous. _____ 5. All annelids in the classes Oligochaeta and Hirudinea have a. gills. b. parapodia. c. a segmented coelom. d. an open circulatory system. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Modern Biology 193 Mollusca Name ______________________________ Class ___________________ Date __________________ SHORT ANSWER Answer the questions in the space provided. 1. How does the function of an earthworm’s crop differ from that of its gizzard? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ 2. List three benefits of earthworm activity. ______________________________ _______________________________________________________________ _______________________________________________________________ 3. What is the function of an earthworm’s aortic arches? ____________________ _______________________________________________________________ 4. Describe the locomotion of a leech on land. ____________________________ _______________________________________________________________ _______________________________________________________________ 5. Critical Thinking Some parasitic leeches are attracted by warmth. What type of host would you expect such leeches to have, and what would be the adaptive advantage of this attraction? _______________________________________________________________ _______________________________________________________________ _______________________________________________________________ STRUCTURES AND FUNCTIONS Identify the structures labeled a–h in the diagram of an earthworm shown below. Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Modern Biology 194 Mollusca