Molluscs 0.0 / 5 ? zoologyOrganismal DiversityUniversityNone Created by: Omar-uniCreated on: 04-01-20 15:07 What are the main characteristics of Molluscs? Soft bodies, Bilaterally symmetrical and Unsegmented 1 of 35 What unique behavior do Molluscs show? Coprophagy 2 of 35 What is Coprophagy? Eating of faeces 3 of 35 What is Autocoprophagy? Eating own faeces 4 of 35 Do Molluscs have an open or closed Circulation system? Open circulation system 5 of 35 What is a Molluscs heart like? They have 1 ventricle and 1 or more Atria 6 of 35 What are the basic characteristics of Chitons? Dioecious , Head no eyes and a Nervous system comprised of discrete ganglia in buccal region 7 of 35 What is the largest class of Molluscs? Gastropods 8 of 35 How many sub-classes of Gastropods are there? 3 9 of 35 What are the 3 subclasses of Gastropods? Prosobranchia, Opisthobranchia and Pulmonata 10 of 35 What is the morphology of Gastropods? Foot, Head, Radula, operculum, shell, torsion, siphon and Body wall 11 of 35 What is Torsion? The rotation of the visceral mass, mantle and shell 180 degrees between the head and foot 12 of 35 When does Torsion occur? During Larval Development 13 of 35 How do Gastropods locomote? Via a muscular foot with mucus and cilia or waves of muscular contraction occurring front to back 14 of 35 What is another way some Gastropods move? Bipedal locomotion, some have a mid-ventral line separating foot into 2 sides 15 of 35 What organ do Gastropods use to rasp up small particles? Odontophore 16 of 35 What is a ribbon of recurved chitinous teeth attached to the Odontophore called? The Radula 17 of 35 What is a Radula used for? Boreing, microphagy, herbivory and predation 18 of 35 How many types of Radula are there and what do they end in? 5, -glossan and -glossate 19 of 35 What is an Oyster Drill? A mollusc that drills holes in shells of mussels and oysters 20 of 35 What aids the drilling of holes in the Oyster drill? Acid secretion from the boring gland 21 of 35 What problems do Oyster drills cause and why? Major financial losses due to damaged oysters in oyster farms 22 of 35 What is a feathery Radula used for? Filtering fine organic debris from soft sands 23 of 35 Which species of Mollusc uses venom? Cone Snails 24 of 35 What do Cone snails hunt? Worms and Fish 25 of 35 How do Cone snails hunt using venom? They use a venomous harpoon containing neurotoxins that fires backwards and forwards 26 of 35 How do Cone snails detect prey? Using Chemoreceptory 27 of 35 How do Molluscs respire? By Gas Exchange across gills or body, cilia draw water into inhalant chamber to gills and out via exhalant chamber 28 of 35 How do most Molluscs reproduce? Most are Dioecious some hermaphroditic. All sexual reproduce mainly through internal fertilisation. 29 of 35 What is Ovoviviparity? Delayed egg laying , releasing live juveniles 30 of 35 What are Scathopoda? Tusk shells 31 of 35 Do Tusk shells have an opening at both ends? Yes 32 of 35 What do Tusk shells not have? Eyes or gills 33 of 35 Do Tusk shells have an opening at both ends? Yes 34 of 35 What do Tusk shells not have? Eyes or gills 35 of 35
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