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NAME _______________________________ MOLLUSK TEST 2 points each MULTIPLE CHOICE: Circle the letter of the answer that best completes the statement. Most mollusks (including clams) _______________________________________ A. are hermaphrodites B. use both sexual and asexual reproduction C. have separate sexes D. have direct development Bivalves become SESSILE as adults. This means they _______________ A. stay in one place and don’t move around much B. don’t need a partner to reproduce C. have their sense organs concentrated in a head area D. can camouflage themselves from predators All mollusks (except cephalopods) have ________________ circulation. A. CLOSED B. OPEN Bivalves are _____________________. A. filter feeders B. carnivorous predators C. grazers D. parasites The only mollusks WITHOUT a RADULA are the _____________________. A. cephalopods B. gastropods C. bivalves All mollusks are ______________________. A. Invertebrate deuterostomes B. Invertebrate protostomes C. Vertebrate deuterostomes D. Vertebrate protostomes Bivalves have ____________________ symmetry A. bilateral B. radial C. no All mollusks have a(n)______________________ A. acoelom B. pseudocoelom C. “true” eucoelom All aquatic mollusks (except cephalopods) have ___________________ development. A. direct B. indirect The only mollusks WITHOUT CEPHALIZATION are the _____________________. A. cephalopods B. gastropods C. bivalves The name A. B. C. D. MOLLUSK comes from the Latin word meaning ___________________. slow moving soft body headless to creep or crawl The coelom in a clam is smaller and has become the ____________________. A. gill compartment B. visceral mass C. mantle cavity D. pericardial cavity Bile is ______________________________. A. form of nitrogen waste excreted by mollusks B. produced by the digestive gland and helps to break down food C. a ciliated larva seen in clams D. a tongue covered with teeth seen in marine mollusks The name A. B. C. D. BIVALVIA comes from the Latin meaning _________________________ sessile marine 2 shells soft body The umbo A. B. C. D. in a clam _______________________ excretes nitrogen waste is the bump on the shell near the hinge has ridges to trap food is a hole that lets water into the clam shell USE LETTERS FROM THE DIAGRAM TO IDENTIFY THE STRUCTURES: ________ MANTLE ________ FOOT _________ GILLS ________ MANTLE CAVITY ________ VISCERAL MASS _________ INCURRENT SIPHON _________ EXCURRENT SIPHON ________ ADDUCTOR MUSCLE * * * * * * * * * * * * * * * BONUS What color is bile? ________________________ Tell the specific kind of food that bile works to break down ________________________ SUPER BONUS ? What term commonly used to refer to clams in the Eastern United States is frequently heard on this popular TV show? ___________________________ USE LETTERS FROM THE DIAGRAM TO IDENTIFY THE STRUCTURES: ________ MANTLE CAVITY ________ VISCERAL MASS _________ ADDUCTOR MUSCLE ________ MANTLE ________ FOOT _________ GILLS _________ EXCURRENT SIPHON ________ INCURRENT SIPHON * * * * * * * * * * * * * * * MATCHING: Match the body part with its function. (YOU CAN USE THEM MORE THAN ONCE!) ________ Flaps near mouth that move food up from gills ________ Traps food in the mucous on its ridged surface ________ Collects and removes nitrogen waste in a clam C. INTESTINE ________ Collects and removes digestive waste D. DIGESTIVE GLAND ________ Area of the clam’s body that contains the heart, digestive, excretory, and reproductive organs ________ Layer that produces the clam’s shell A. ADDUCTOR MUSCLES B. PALPS E. MANTLE F.GILLS G. KIDNEY ________ ________ ________ Control the opening and closing of the clam’s shell H. MANTLE CAVITY Makes bile to break down food I. PERICARDIAL CAVITY Entrance and exit for water entering and leaving the mantle cavity J. VISCERAL MASS K. SIPHONS _________ Space surrounding heart L. HEART _________ Pumps hemolymph _________ Finishes digestion and absorbs nutrients _________ Exchanges oxygen and carbon dioxide with water ________ * * Space inside the clam’s shell between mantle and visceral mass * * * * * * * * MATCH THE CLAM BODY ORGAN WITH ITS BODY SYSTEM: You can use them more than once! _________ gills _________ intestine _________ ganglia _________ kidney _________ heart _________ digestive gland A. B. C. D. E. CIRCULATORY DIGESTIVE RESPIRATORY NERVOUS EXCRETORY * * * * * MATCHING: Match the body part with its function. (YOU CAN USE THEM MORE THAN ONCE!) ________ Flaps near mouth that move food up from gills ________ Traps food in the mucous on its ridged surface B. GILLS ________ Collects and removes nitrogen waste in a clam C. HEART ________ Collects and removes digestive waste D. SIPHONS ________ Area of the clam’s body that contains the heart, digestive, excretory, and reproductive organs ________ Layer that produces the clam’s shell A. DIGESTIVE GLAND E. INTESTINE F. ADDUCTOR MUSCLES G. MANTLE ________ ________ ________ Control the opening and closing of the clam’s shell H. PERICARDIAL CAVITY Makes bile to break down food I. VISCERAL MASS Entrance and exit for water entering and leaving the mantle cavity J. MANTLE CAVITY K. PALPS _________ Space surrounding heart L. KIDNEY _________ Pumps hemolymph _________ Finishes digestion and absorbs nutrients _________ Exchanges oxygen and carbon dioxide with water _________ Space inside the clam’s shell between mantle and visceral mass * * * * * * * * * * MATCH THE CLAM BODY ORGAN WITH ITS BODY SYSTEM: You can use them more than once! _________ kidney _________ intestine _________ heart _________ gills _________ ganglia _________ digestive gland A. B. C. D. E. CIRCULATORY DIGESTIVE RESPIRATORY NERVOUS EXCRETORY * * * * * MATCH THE WORD WITH ITS DEFINITIONI; _________ The twisting of a gastropod larva’s visceral mass 180˚ so the posterior ends up near the front of the animal A. TORSION ________ B. HEMOLYMPH Tongue-like strip with abrasive teeth used in feeding in some mollusks C. HEMOCOEL ________ ________ _________ Circulatory fluid (blood) in an animal with open circulation D. FILTER FEEDER Organism that strains food from the water E. CHROMATOPHORE A cilitated larva found in many aquatic mollusks and some annelids F. RADULA G. TROCHOPHORE ________ Pigment cells in the mantle of cephalopods which can change color to allow them to blend in with their surroundings _________ the SPACE where the blood circulates in an organism with an open circulatory system * * * * * * * * * * * * * * * * * TRUE OR FALSE Circle T if the statement is TRUE. Circle F if the statement is FALSE. T F ALL mollusks have a protective shell. T F The surface of a clam’s gill is smooth and flat to allow the water to slide past easily. T F Bile is colorless. T F The umbo in a clam is closest to the anterior end. T F Clams have a pair of cerebral ganglia and one ventral nerve cord, just like an earthworm. T F The mantle cavity in a clam is the coelom. * * * * * * * * * * * * NAME _______________________________ MOLLUSK TEST 2 points each MATCH THE WORD WITH ITS DEFINITIONI; _________ The twisting of a gastropod larva’s visceral mass 180˚ so the posterior ends up near the front of the animal A. RADULA ________ B. CHROMATOPHORE Tongue-like strip with abrasive teeth used in feeding in some mollusks C. TROCHOPHORE ________ ________ _________ Circulatory fluid (blood) in an animal with open circulation D. HEMOCOEL Organism that strains food from the water E. HEMOLYMPH A cilitated larva found in many aquatic mollusks and some annelids F. TORSION G. FILTER FEEDER ________ Pigment cells in the mantle of cephalopods which can change color to allow them to blend in with their surroundings _________ the SPACE where the blood circulates in an organism with an open circulatory system * * * * * * * * * * * TRUE OR FALSE Circle T if the statement is TRUE. Circle F if the statement is FALSE. T F ALL mollusks have a protective shell. T F The surface of a clam’s gill is smooth and flat to allow the water to slide past easily. T F Bile is colorless. T F The umbo in a clam is closest to the anterior end. T F Clams have a pair of cerebral ganglia and one ventral nerve cord, just like an earthworm. T F The mantle cavity in a clam is the coelom. * * * * MATCH THE DESCRIPTION WITH THE CORRECT MOLLUSK CLASS: You can use them more than once! GASTROPODA Octopus, squid, and chambered nautilus Clams, oysters, and scallops Snails, slugs, nudibranchs, and conchs All have 2 shells Most have ONE shell Most have NO shell Group that has chromatophores Only group WITHOUT a radula Mollusk group that has TORSION CEPHALOPODA BIVALVIA MATCH THE DESCRIPTION WITH THE CORRECT MOLLUSK CLASS: GASTROPODA Clams, oysters, and scallops Octopus, squid, and chambered nautilus Snails, slugs, nudibranchs, and conchs Most have NO shell Most have ONE shell All have 2 shells Only group WITHOUT a radula Mollusk group that has TORSION Group that has chromatophores CEPHALOPODA BIVALVIA SHORT ANSWER: LIST 3 CHARACTERISTICS FOUND IN ALL MOLLUSKS (REMEMBER: Don’t just give me a list of body parts! What makes it a mollusk?) _______________________________ _______________________________ _______________________________ Clams belong to the: KINGDOM _____________________________ PHYLUM ______________________________ CLASS ______________________________ Name two (2) of the body systems that release their products into the mantle cavity in a clam. ____________________________ * * * * * * __________________________________ * * * * * * * USE WORDS IN THE WORD BANK TO COMPLETE THE FOLLOWING SENTENCE DORSAL VENTRAL CLAMS follow the body plan seen in earthworms and other invertebrates because they have _________________ nerve cords and a ________________ heart. * * SHORT ANSWER: LIST 3 CHARACTERISTICS FOUND IN ALL MOLLUSKS (REMEMBER: Don’t just give me a list of body parts! What makes it a mollusk?) _______________________________ _______________________________ _______________________________ Clams belong to the: KINGDOM _____________________________ PHYLUM ______________________________ CLASS ______________________________ Name two (2) of the body systems that release their products into the mantle cavity in a clam. ____________________________ * * * * * * __________________________________ * * * * * * * USE WORDS IN THE WORD BANK TO COMPLETE THE FOLLOWING SENTENCE DORSAL VENTRAL CLAMS follow the body plan seen in earthworms and other invertebrates because they have a _________________ heart and ________________ nerve cords. * * COMPARE OR CONTRAST: Fill in the comparison chart below: Tell one way reproduction in clams and earthworms is ALIKE or DIFFERENT. Then you pick 2 more characteristics/body systems to compare. REMEMBER USE SOME SCIENCE WORDS! Think about what kind of body systems they have! Characteristic/ BODY SYSTEM CLAMS EARTHWORMS 1. Reproductive 2. 3. * * * * * * * * * * * * * * * BONUS What color is bile? ________________________ Tell the specific kind of food that bile works to break down ________________________ SUPER BONUS ? What term commonly used to refer to clams in the Eastern United States is frequently heard on this popular TV show? ___________________________ OMPARE OR CONTRAST: Fill in the comparison chart below: Tell one way reproduction in clams and earthworms is ALIKE or DIFFERENT. Then you pick 2 more characteristics/body systems to compare. REMEMBER USE SOME SCIENCE WORDS! Think about what kind of body systems they have! Characteristic/ BODY SYSTEM 1. Reproductive 2. 3. EARTHWORMS CLAMS