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[Pages:4]Name
Date
Worms and Mollusks
Section 4 Segmented Worms
Main Idea
Details
Skim Section 4 of the chapter. Write three facts that you discovered about segmented worms.
1. Accept all reasonable responses.
2.
3.
Review Vocabulary Use your book or dictionary to define protostome.
protostome an animal with a mouth that develops from the opening in the
gastrula
New Vocabulary Use your book or dictionary to define each term.
crop part of the worm's digestive tract where food and soil taken in by the
mouth are stored before passing on to the gizzard
setae
tiny bristles on each segment that push into the soil and anchor the worm during movement
gizzard
muscular sac containing hard particles that help grind soil and food before they pass into the intestine
clitellum a thickened band of segments that produces a cocoon from which
young earthworms hatch
Academic Vocabulary Define convert to show its scientific meaning.
convert to change from one form to another
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Worms and Mollusks 265
Name Section 4 Segmented Worms (continued)
Date
Main Idea
Details
Body Structure
I found this information
on page
.
SE, pp. 745?748
RE, pp. 305?307
Summarize the characteristics of segmentation. Accept all
reasonable responses.
Segments separated by septa .
Segmentation
Segments contain structures for
digestion , excretion , and locomotion .
A segment's rigidity is created by
fluid within the coelom .
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Sequence the process of digestion in an earthworm.
Food and soil enter through the mouth.
They pass through the pharynx into the crop, where they are stored.
The soil and food pass to the gizzard, where they are ground.
The ground materials pass into the intestine, where nutrients are absorbed.
Undigested material passes out of the body through the anus.
266 Worms and Mollusks
Name Section 4 Segmented Worms (continued)
Date
Main Idea
Details
Diversity of Annelids/Ecology
of Annelids/ Evolution of Mollusks and
Annelids
I found this information
on page
.
SE, pp. 748?751
RE, pp. 307?308
Organize information about annelids. Identify two characteristics
of each annelid. Then write the class to which they belong. Accept
all reasonable responses.
fanworms bristleworms
leeches
earthworms
well-developed sense organs, including eyes; many setae; parapodia for swimming
flattened bodies; no setae; front and rear suckers; saliva contains chemical anesthetic
ingest soil to extract nutrients; aerate the soil; sensitive to light and vibrations
Class: Polychaeta
Class: Hirudinea
Class: Oligochaeta
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Analyze two ways that each of these annelids benefit their ecosystem. Accept all reasonable responses.
Earthworms
food for many animals
aerate the soil
Marine Polychaetes
convert organic debris on the ocean floor into carbon dioxide food for marine predators
Sequence these developments in the evolution of annelids: body suckers, parapodia, clitella. From earliest to latest: parapodia, clitella, body suckers
SUMMARIZE Compare the type of circulatory system found in annelids with that found in some mollusks. State the advantage of the annelid type.
Accept all reasonable responses. Annelids have closed circulatory systems, with the blood
entirely enclosed in blood vessels. Some mollusks also have open circulatory systems, in
which the blood flows through vessels and in open spaces. A closed system provides a
more efficient means for gas exchanges (oxygen and carbon dioxide) in the animal.
Worms and Mollusks 267
Name
Tie It Together
Create a mini poster that highlights the diversity of worms.
Accept all reasonable responses.
Date
SUMMARIZE
Copyright ? Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
268 Worms and Mollusks
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