Worms and Mollusks - BIOLOGY 11 - Home
[Pages:3]Name
Date
Worms and Mollusks
Section 3 Mollusks
Main Idea
Details
Skim Section 3 of the chapter. Write two questions that come to mind from reading the headings and illustration captions.
1. Accept all reasonable responses.
2.
Review Vocabulary Use your book or dictionary to define herbivore.
herbivore an organism that eats only plants
New Vocabulary Use your book or dictionary to define each term.
mantle a membrane that surrounds the internal organs of a mollusk;
in mollusks with shells, it secretes the shell
radula
in the mouth of many mollusks, the rasping, tonguelike organ with rows of teeth; used to drill, scrape, or tear up food
gills a system of filamentous, respiratory projections on the mantle where
oxygen and carbon dioxide are exchanged in the blood
open circulatory system
system in which blood moves through vessels into open spaces around the body organs
closed circulatory system
system in which blood moves through the body enclosed entirely in blood vessels
nephridia organs that remove metabolic wastes from an animal's body
siphon
a tube in octopuses and squids used to expel water taken into the mantle cavity
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
262 Worms and Mollusks
Name Section 3 Mollusks (continued)
Date
Main Idea
Details
Body Structure
I found this information
on page
.
SE, pp. 737?741
RE, pp. 301?303
Model a snail and a squid. Label the body parts of each.
Diagrams should resemble SE p. 738. Accept all reasonable responses.
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
List the snail and squid structures that differ.
the snail's foot, the squid's tentacles, and the squid's reduced internal shell
Distinguish two ways mollusks feed. Radula: a tonguelike organ with rows of teeth used to scrape, drill,
and tear up food
Filter feeders: draw in food from the water and strain it
Compare the way mollusks reproduce in water and on land.
in water: eggs and sperm are
released at the same time and fertilization is external
on land: many land mollusks
are hermaphrodites and produce both sperm and eggs, and fertilization takes place within the animal
Worms and Mollusks 263
Name Section 3 Mollusks (continued)
Date
Main Idea
Details
Diversity of Mollusks, Ecology of Mollusks
I found this information
on page
.
SE, pp. 742?743
RE, p. 304
Analyze the three classes of mollusks and the meaning of each class name. Provide at least three examples of each class.
Mollusks
Gastropoda stomach-footed
Bivalvia two shells
Cephalopoda head-footed
Examples:
periwinkles
conches abalones
Examples:
clams oysters scallops
Examples:
octopus squid
cuttlefish
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Classify each mollusk in the left column of the table. Place it in the proper class.
Class
Gastropoda
Mollusk Characteristics has a single shell and a large foot under the body
Bivalvia Gastropoda Cephalopoda
has no radula; has two shells connected with a ligament, and a large, muscular foot for digging in the sand
is brightly colored and has a layer of mucus covering its body; has a large foot under the body and no shell
has a radula and tentacles; has no shell; squirts ink at predators
CONNECT Compare mollusks' excretory structures with those of two or more groups that evolved earlier.
Accept all reasonable responses. Mollusks have nephridia, excretory structures that filter
metabolic wastes from the coelom and remove the wastes from the body. Planarias have
simpler structures called flame cells that move fluid along and eliminate water. A jellyfish has
no excretory structures; water and salts move in and out of the body by osmosis.
264 Worms and Mollusks
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