2. Chapter: Mollusks, Worms, Arthropods, Echinoderms Table of Contents Section 3: Arthropods Section 1: Mollusks Section 2: Segmented Worms Section 4: Echinoderms

25. 1 Section Check Question 1 Which structure is responsible for exchanging carbon dioxide from the mollusk for oxygen in the water?

26. 1 Section Check A. heart B. gills C. mantle D. radula

27. 1 Section Check Answer The answer is B. Gills are located in the mantle cavity.

28. 1 Section Check Question 2 Which structure is responsible for helping this organism move?

29. 1 Section Check A. foot B. mantle C. Mantle cavity D. radula

30. 1 Section Check Answer The answer is A. Slugs and snails move by rhythmic contractions of the muscular foot.

31. Section Check Question 3 A squid is what type of mollusk? A. bivalve B. cephalopod C. gastropod D. radula 1

32. Section Check Answer The answer is B. Cephalopods have large, well developed heads and their foot is divided into many tentacles. 1

52. 2 Section Check Question 1 Which letter corresponds with the setae? A. A B. B C. C D. D

53. 2 Section Check Answer The answer is A. Setae are the bristlelike structures segmented worms use to hold onto soil and to move.

54. 2 Section Check Question 2 Which letter corresponds with the structures that pump blood through the body? A. D B. E C. F D. G

55. 2 Section Check Answer The answer is D. Earthworms have five aortic arches that pump blood throughout their bodies.

57. 2 Section Check Answer The answer is A. Leeches are sometimes used after surgery to keep blood flowing to the repaired area.

96. 3 Section Check Question 1 The word arthropoda means_______. A. many bristles B. head-footed C. little rings D. jointed foot

97. 3 Section Check Answer The answer is D. Crabs are an example of an arthropod.

98. 3 Section Check Question 2 Which is NOT one of the three body regions of an insect? A. abdomen B. appendage C. head D. thorax

99. 3 Section Check Answer The answer is B. Insect bodies consist of a head, thorax, and abdomen.

100. 3 Section Check Question 3 Which is an arachnid? A. butterfly B. conch C. earthworm D. tick

101. 3 Section Check Answer The answer is D. Arachnids have two body regions and four pairs of legs, but no antennae.

117. Question 1 In echinoderms, the _______ is a network of water-filled canals with thousands of tube feet connected to it which allows for movement, exchange of carbon-dioxide and oxygen, capture of food and release of waste. 4 Section Check

118. Answer The answer is water-vascular system. The water-vascular system is unique to echinoderms. 4 Section Check

119. Question 2 Which letter corresponds with the tube feet? 4 Section Check

120. Answer The letter C represents the tube feet. Tube feet are hollow, thin-walled tubes that each end in suction cup. They allow sea stars to move. 4 Section Check

121. 4 Section Check Question 3 Which is a survival tactic of an echinoderm? A. arms break off easily B. jet propulsion C. pinchers D. venom

122. 4 Section Check Answer The answer is A. Brittle stars have arms that break off easily if they are grabbed by a predator, allowing for escape. The lost parts regenerate quickly.

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124. End of Chapter Summary File