Gifted Note Sheet Invertebrates Mollusks 2017
· General characteristics:
o ______symmetrical.
o More than two cell layers, ______and organs.
o Body highly variable in form
o Most mollusks have ______parts: foot (takes many forms), shell (internal or external), ______and visceral mass.
· , Habitats: both ______and aquatic environments
· Three common classes: ______(clams, oysters, mussels, scallops),
o -shell secreted by mantle
o -no head, no radula, little cephalization
o ______(octopi, nautilus, cuttlefish, squid)
o camera-type eyes
o -powerful beak for tearing prey apart
o Gastropoda (snails, slugs, conch and sea slugs)
o -have an eleongated, flattened foot and a one-piece shell that protects the visceral mass
· Nutrition: Herbivores and ______
· Feeding:
o Some use ______(hard tongue for scraping)
o Some ______feeders
o Carnivores use specialized ______parts
· Digestion: have a ______digestive tract, food is absorbed in intestine
· Excretion:
o Bivalves diffuse wastes through ______siphon
o More complex use ______ to filter cellular waste containing nitrogen and excrete solid waste through anus
· Circulation:
o slow moving: have an ______circulatory system that pump blood into a ______with blood diffusion back to the circulatory system between cells where the blood is pumped by a ______into the body cavities and tissues are surrounded by the blood (ex) snail
o fast moving: have a true ______circulatory system that have the blood ______at all times in vessels, blood is pumped by a heart through vessels (ex) octopus
· Respiration:
o Land: use ______of oxygen and carbon dioxide through skin requiring cells to be close to external environment and skin must stay moist for ______
o Aquatic: ______are used to extract oxygen from water
· Nervous: demonstrates ______(concentration of nervous tissue at head of organism)
o some have simple mass of ______or nervous tissue along with sensory receptors, ex. slugs
o some also have nerve ______, ex. bivalves
o most advanced have ______and ______, ex. Octopi
§ Octopi have a capacity for learning.
· Reproduction:
o Sexual
o Some are ______ , Bivalves and Cephalopods, and some are hermaphroditic, land snails (typically have system in place to ______self fertilization)
o Both ______and external fertilization
§ internal ex. tentacle mollusks
§ external ex. snails and bivalves
· Mobility:
o Snails and slugs ______on the foot, travel on slime trail
o Clams and scallops ______with the foot
o Squid, octopus swim with ______(modified foot) and jet propulsion