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Molluscs Notes
Notes about molluscs in marine biology.
| Question | Answer |
|---|---|
| What is the largest group of molluscs? | Gastropods |
| What are some examples of gastropods? | Snails, limpets, abalones, and sea slugs |
| What does the word gastropod mean? | Belly-footed |
| What shape of shells do most gastropods have? | Coiled |
| What type of gastropods has no shell? | Sea slugs |
| How do gastropods feed? | They graze on seaweed using their radula, some are deposit feeders, some are suspension feeders, some use their radula to capture prey which those are carnivores |
| What is a deposit feeder? | Gastropods that eat food on the floor in the body of water. |
| What are suspension feeders? | Gastropods that eat food dangling from higher ceilings. |
| When a gastropod retracts its head and foot into its shell, what blocks the shell opening? | A tough operculum |
| What are some examples of bivalves? | Clams, oysters, scallops, mussels, ands hipworms |
| How do bivalves feed? | They are specialised filter feeders |
| What is the body structure of a bivalve? | They have compressed Bodies in a mantle cavity covered by 2 shells or valves |
| How do bivalves breath? | They have expanded, folded gills which also play a role in filter feeding |
| Do bivalves have radula? | No |
| How do bivalves move? | They use siphons to collect and expel water from their mantle cavities |
| What are the muscles that allow bivalves to open and close called? | Abductor muscles |
| How do clams burrow? | They use their foot |
| How do oysters and mussels tend to live? | Attached onto hard substrates or grow attached to each other |
| What does it mean that scallops are free living? | They don't need to attach to any surface or dig into any surface |
| What are some examples of cephalopods? | Squids, octopuses, cuttlefishes, and chambered nautilus |
| What does the word cephalopod mean? | Head-footed |
| How are cephalopods able to swim so fast? | By using water jet propulsion by collecting and expelling water from their mantle cavities using siphons (Funnels) |
| How developed is a cephalopod's nervous system? | Very well developed with large, complex eyes, brains, and nerves |
| What does a cephalopod have around its body? | A think mantle |
| What do cephalopods use to eat their prey? | Radula and beak-like jaws to crush and rip prey |
| Where is the shell on a cephalopod? | Internal or absent |
| What is the internal shell of a squid called? | The pen |
| Do chambered nautilus have shells? | No |
| What is the shell structure of chitons? | It has a dorsal shell of 8 plates |
| What does ventral mean? | Front |
| What ventral body parts do chitons have? | Ventral muscular foot and ventral mouth with radula |
| How do chitons feed? | They graze on seaweed and eat small invertebrates on rocky shores |
| What does dorsal mean? | Back |
Created by:
CommsMKSoz
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