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MOLLUSK Review. Name one of the three classes of mollusks you learned about. Gastropods, cephalopods, Bivalves The free swimming ciliated larva found.

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Presentation on theme: "MOLLUSK Review. Name one of the three classes of mollusks you learned about. Gastropods, cephalopods, Bivalves The free swimming ciliated larva found."— Presentation transcript:

1 MOLLUSK Review

2 Name one of the three classes of mollusks you learned about. Gastropods, cephalopods, Bivalves The free swimming ciliated larva found in most aquatic mollusks is called a _________________ Trochophore

3 The space around the heart is called the _____________ space (cavity). pericardial

4 In mollusks the heart and organs for digestion, excretion, and reproduction are found in this body region. Visceral mass The octopus, squid, and chambered nautilus belong to this group of Mollusks. cephalopods

5 This bump on the dorsal surface of a clam near the hinge is the _______ umbo Pigment cells in the outer mantle layer in cephalopods that can change color for camouflage. chromatophores

6 Identify the colored structures. Anterior & posterior adductor muscles The nervous system in a clam consists of _____________________________ 3 pairs of ganglia connected by 2 pairs of nerve cords

7 Type of body cavity found in mollusks. No coelom pseudocoelom eucoelom eucoelom The powerful muscles that open and close a clam shell are the ___________ Adductor muscles (posterior and anterior)

8 Identify the body system each organ belongs to: Kidney __________________ Testes/ovary ____________________ Gills ___________________ Digestive gland ___________________ Ganglia ____________________ Heart ____________________ Excretory Reproductive Respiratory Digestive Nervous Circulatory

9 What keeps water moving over the gills in a clam? Cilia on gills move water A flexible tongue-like strip of tissue covered with tough, abrasive teeth that point backwards found in some mollusks. radula

10 Compare Digestive and Nitrogen waste DIGESTIVE WASTE NITROGEN WASTE Made where? Comes from? Removed by what body system? Leaves body as? In digestive tract By body cells Digestive Excretory Feces ammonia, urea, OR uric acid Left over frombreakdown of proteins undigested food during metabolism

11 This structure is the _____________ intestine Only cephalopod with a shell Chambered nautilus

12 Name the group of mollusks that does NOT have a radula. bivalves Layer of epidermis lining the shell of a clam mantle

13 #2 = ________________________Anterior adductor muscle #3 = _______________________ gills #1 #2 #3

14 The process during larval development in which the visceral mass in gastropods twists around 180º bringing the mantle cavity, gills, and anus to the front of the animal. torsion Clams have a(n)__________ circulatory system. Open Closed open

15 This part of the clam secretes the shell. mantle Mollusks have _________ symmetry. None radial bilateral bilateral

16 Fertilization in clams is __________ internal external both both Depends on species- in freshwater clams its usually internal in marine (ocean) clams its external Identify this structure heart

17 The circulatory fluid (blood) in a mollusk is called _______________ hemolymph Respiratory organ in clams. gills

18 The flaps that wave to move food up toward the mouth are called ___________________ palps The organ that passes through the pericardial cavity and lies under the heart is the __________________ intestine

19 The space between the mantle and the visceral mass. Mantle cavity Which group of mollusks does NOT have a shell? Bivalves cephalopods gastropods cephalopods

20 Organisms that stay in one place and don’t move around are called ___________________ Sessile Tell an advantage of having a coelom compared to a pseudocoelom. 1. Muscles of body wall are separate from those of gut. (Can move and digest at same time) 2. Coelom provides space for circulatory system to transport blood 3. Provides a space for organs

21 Mollusks are _______________ vertebrates invertebrates invertebrates mantle This blue structure secretes the shell.

22 Which group of mollusks is mainly sessile? Bivalves gastropods cephalopods bivalves T or F Most clams are hermaphrodites like earthworms. False; most clams have separate sexes

23 ________________ in a mollusk’s shell makes it hard. Calcium carbonate An organism with a true coelom is called a ______________. eucoelomate

24 Identify this structure. foot Clams and oysters belong to this group of mollusks. Bivalves gastropods cephalopods Bivalves

25 This structure starts digestion and grinds food. stomach Cephalopods are the only mollusks with a ___________ circulatory system. open closed closed

26 Fertilization in cephalopods is internal external Internal; Males use a specialized tentacle to transfer packets of sperm to the mantle cavity of the female Only mollusk group that develops from egg to juvenile without becoming a trochophore larva. cephalopods

27 Snails and slugs belong to this group of mollusks. bivalves cephalopods gastropods gastropods Name one of the functions of the gills in a clam. 1.Gas exchange (oxygen and carbon dioxide) 2.Trap food particles

28 This opening is the _________. Anus

29 Name part that belongs to each body system: Excretory __________________ Digestive ____________________ Muscular ___________________ Nervous ___________________ Circulatory ____________________ kidney Palps, Esophagus, stomach, digestive gland, intestine, anus Adductors, foot Ganglia, nerve cords Heart, hemolymph, hemocoel

30 This is the ________________________. Digestive gland

31 Another word that means shell is ___________. valve Type of circulatory system in which blood is NOT enclosed in vessels open

32 Tell one body part you might look for if you wanted to tell direction in a clam. UMBO- it’s on the dorsal side FOOT- triangle points to the anterior end PALPS- at anterior end SIPHONS- at posterior end Which group of mollusks has chromatophores that can change color to blend in with the surroundings? cephalopods

33 Why does the surface of the gills have ridges? Increases surface area to absorb more oxygen & catch more food The excretory organ in a clam is the nephridia kidney flame cells kidney

34 This is the __________ __________ Incurrent siphon This organ surrounds the stomach and makes digestive enzymes. Digestive gland

35 How does a trochophore larva swim? Ring of cilia around middle help it move Body system that removes nitrogen waste from the body cells digestive nervous excretory respiratory excretory

36 #1 = ________________________foot #2 = _______________________ mantle #1 #2

37 In a clam the coelom mainly surrounds the heart and is called the______________ cavity. pericardial Organisms that strain food from the water like clams are called _________. predators filter feeders scavengers autotrophs Filter feeders

38 These are located on the surface of the clam’s shell and can help tell it’s age. Growth rings This part of the clam is the ____________ foot

39 Name a part of the nervous system in a clam Ganglia OR nerve cord This opening is located near the excurrent siphon so waste is washed away anus

40 #1 = ________________________Posterior adductor muscle #3 = _______________________ mantle #1 #2 #3

41 This is the ____________ ____________ Excurrent siphon Organ in a clam is where nutrients are absorbed. Digestive gland

42 Most organisms in this class of mollusks have 1 shell (or none) gastropods PHYLUM that clams, octopus, slugs, and snails belong to MOLLUSCA OR Mollusk

43 Tell one way the nervous system in a clam is like that of an earthworm Both have ganglia Both have a nerve cord (clam has 2 pairs) Tell one way the reproductive system in a clam is different from an earthworm EarthwormsClams hermaphroditeshave 2 sexes (male & female) direct developmentindirect development (larva) external fertilization internal/external fertilization

44 The 3 functions of the digestive gland are to __________________ Make digestive enzymes (bile) Finish digestion Absorb nutrients The excretory organ in a clam is the ______________ kidney

45 This space you see when you opened your clam is called the ________________ Coelom pericardial space mantle cavity mantle cavity

46 The intestine runs through the space shown and is covered by the _________ HEART

47 The function of the palps is to __________________ Move food to the mouth The ____________ end of the clam is closest to the umbo. Anterior Posterior anterior

48 Identify the body part by its description: bump on dorsal side of shell ______________ Edge of shell shortest distance from umbo ______________________ Tissue that lies on top of tube running through pericardial space ___________________ Lines on clam shell ___________________ Layer lining shell ____________________ umbo anterior heart Growth rings Mantle

49 The function of the gills is to __________________ A. remove oxygen from water B. filter food particles C. make digestive enzymes D. excrete nitrogen waste Both A & B are correct Clams belong in the ______________ Kingdom ______________ Phylum ______________ Class Animalia Mollusca (mollusks) Bivalvia (bivalves)

50 Identify the function of each body part: Adductor muscles__________________ intestine ____________________ Gills ___________________ Digestive gland ___________________ Palps ____________________ Heart ____________________ Mantle ________________________ Open and close shell Collect and remove digestive waste Exchange gases & trap food Make digestive enzymes to break down food; finish digestion; absorb nutrients Move food up from gills to mouth Pump hemolymph (blood) Makes shell

51 True OR False Clams show cephalization. FALSE No true head area- Ganglia/sense organs are spread out throughout body not concentrated in head Tube that connects the mouth and the stomach in a clam esophagus

52 The excretory organ in clams is the __________________ kidney In Latin the name Mollusca means ________________. soft two filter little body shells feeder rings “soft body”

53 Identify the body part by its description: looks like a piece spaghetti inside visceral mass __________________ Greenish brown area in anterior end ____________________ White fans in front of gills ___________________ Long flat structure with ridges (stripes) that runs along side of clam ___________________ intestine Digestive gland palps gills

54 Type of symmetry seen in clams bilateral Clams, oysters, octopus, snails, and squid belong to the PHYLUM _______________ Mollusca

55 Kind of circulatory system seen in an octopus: open closed Mollusks are _______________ invertebrates vertebrates Closed All other mollusks have an open system Invertebrates (no backbone)

56 Clams show __________ development direct indirect indirect They hatch as trochophore larvae and change into their adult form In Latin the name Bivalvia means ________________. soft two filter little body shells feeder rings “2 shells”

57 What causes oxygen and carbon dioxide to move into and out of a clam? Diffusion moves molecules from where there is a HIGH concentration to where there is a LOW concentration Why do gills have ridges? Increases surface area

58 What is the disadvantage of an OPEN circulatory system? Less efficient way to transport nutrients and oxygen High and low oxygen blood mix Why is it a good plan for a clam to have its anus near the excurrent siphon? Washes away digestive waste

59 TELL WHICH BODY SYSTEM EACH PART BELONGS TO gills __________________________ Ganglia _________________ heart___________________ kidney _________________ adductors ____________________ intestine ____________________ respiratory nervous circulatory excretory muscular digestive

60 MOLLUSKS are _____________ protostomes deuterostomes protostomes Give an example of a mollusk that is a bivalve Clams, oysters, scallops

61 Match the Mollusk with its CLASS Clams, oysters, scallops ___________ Squid, octopus, chambered nautilus ______________ Snails, slugs, conchs, Nudibranchs ______________ BIVALVIA CEPHALOPODA GASTROPODA

62 With a few exceptions: Bivalves have _____ shell(s) Gastropods have _____ shell(s) Cephalopods have ____ shell(s) 2 Most 1 few 0 0 (Except nautilus)

63 Name 3 body systems that use the mantle cavity as an exit Digestive-anus releases feces here Excretory- Kidney releases urea here Reproductive- sperm and eggs are released here (external) Or sperm and eggs join here and larva exits (internal) Respiratory also uses this space- gills are located here

64 COMPARE: Earthworms Clams RESPIRATORY CIRCULATORY NERVOUS gills Aortic arches closed Breathe through skin heart open 1 pr cerebral ganglia 1 ventral nerve cord 3 pr ganglia 2 pr nerve cords

65 COMPARE: Earthworms Clams COELOM ? Absorbs nutrients? EXCRETORY True; pericardial cavity intestine true Digestive gland nephridiakidney

66 TELL 3 characteristics of ALL Mollusks invertebrates protostomes Soft bodies Bilateral symmetry trochophore larvae (if indirect) eucoelomates

67 Name the colored structure: palps Give its function: Move food trapped on gills up to mouth

68 Name the colored structure: mantle Give its function: Secrete shell

69 Name the colored structure: foot Give its function: locomotion

70 Name the colored structure: Visceral mass Give its function: Contains body organs

71 Name the colored structure: heart Give its function: Pump hemolymph (blood)

72 Name the colored structure: Pericardial cavity(space) This could also be called the _____________ coelom

73 Name the colored structure: Digestive gland Give its functions: Make bile, finish digestion, absorb nutrients

74 Name the colored structure: anus It is the exit opening for which Body system? digestive


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