Biology 2 Ch. 35 Mollusks
Most have one shell
Gastropods
Has bilateral symmetry
Gastropods. Bivalves
External shells present in some species
Gastropods. Bivalves. Cephalopods.
Invertebrate
Gastropods. Bivalves. Cephalopods.
Some species are venomous
Gastropods. Cephalopods.
Uses a radula for feeding
Gastropods. Cephalopods.
Mantle
Later that produces the protective shell in a mollusk
The name MOLLUSK comes from the Latin word meaning _____
Soft body
False
The space seen inside an opened clam shell is the coelom. ((Mantle cavity))
Mollusks have a _____
"True" eucoelom
Which is true about clam reproduction?
-freshwater clans have internal fertilization -marine clams have external fertilization -all clams have indirect development
Two advantages of a coelom
-separates organs into compartments -works individually (organs)
True
An octopus can see images, solve simple problems, and distinguish objects by shape and texture.
Bivalves have ____ symmetry.
Bilateral
Can form pearls
Bivalves
Clams. Oysters. Scallops.
Bivalves
Has a two part hinged shell
Bivalves
Has an open circulatory system
Bivalves
Has no district head
Bivalves
Most have two shells
Bivalves
Only mollusks with NO radula
Bivalves
Uses gills for both respiration and food collection
Bivalves
False
Bivalves, cephalopods, and Gastropods have cephalization. ((Not bivalves))
All species are carnivorous predators
Bivalves. Cephalopods.
Clam. Class and phylum
Bivalves. Mollusk.
Bite prey with beak
Cephalopods
Can change color for camouflage
Cephalopods
Have the most advanced invertebrate brain
Cephalopods
Intelligent, well developed nervous system.
Cephalopods
Most have NO shell
Cephalopods
Octopus. Squid. Chambered nautilus.
Cephalopods
Use a type of jet propulsion for movement
Cephalopods
Octopus. Class & Phylum
Cephalopods. Mollusks.
Which of the following is true about a clam's nervous system?
Clams have 3 pairs of ganglia and 2 pairs of nerve cords.
Hemolymph
Circulatory fluid or "blood" in an organism with open circulation
Sessile
Describes organisms that stay in one place and don't move much
Kidney
Excretory organ in clams
Trochophore
Free-swimming ciliated larva seen in most aquatic mollusks
Gills are organs specialized for ___
Gas exchange
Snails. Slugs. Conchs. Abalones. Nudibrachs
Gastropod
All aquatic mollusks except cephalopods have ____ development.
Indirect
Clam
K-Animal P-Mollusk C-Bivalves
False
Marine clams live in fresh water, like lakes or streams. ((Salt, oceans))
Adductor
Muscles that open and close the clam's shell
Chromatophore
Pigment cells located in the outer mantle in cephalopods which can produce a sudden color change to provide camouflage
Visceral mass
Place in a clam where the heart, digestive, excretory, and reproductive organs are located
Hemocoel
Place in an organism with open circulation where the circulatory fluid is found
Torsion
Process during development in snails in which their body twists 180 so that their mantle cavity, gills, and anus end up at their anterior end
Cephalopods are different from other kinds of mollusk a because they have ______
The most advanced "brain" of all the mollusks
Parts. Top left going counterclockwise.
Umbo. Foot. Intestines. Reproductive organs. Mantle. Gills. Anus. Adductor. Kidney. Heart. Stomach
