Biology 2 Ch. 35 Mollusks

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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


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