Download 25.4 Segmented worms

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
protostome
Use your book or dictionary to define protostome.
an animal with a mouth that develops from the opening in the
gastrula
New
Vocabulary
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
crop
Use your book or dictionary to define each term.
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
convert
Define convert to show its scientific meaning.
to change from one form to another
Worms and Mollusks
265
Name
Date
Section 4 Segmented Worms
Main Idea
Body Structure
I found this information
.
on page
SE, pp. 745–748
RE, pp. 305–307
(continued)
Details
Summarize the characteristics of segmentation. Accept all
reasonable responses.
Segments contain
structures for
Segments separated
by
septa
.
digestion
,
excretion
,
and locomotion .
Segmentation
A segment’s rigidity is
created by
.
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.
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Worms and Mollusks
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
fluid within the coelom
Name
Date
Section 4 Segmented Worms
Main Idea
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
(continued)
Details
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
Analyze two ways that each of these annelids benefit their
ecosystem. Accept all reasonable responses.
Earthworms
food for many animals
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
aerate the soil
convert organic debris on the ocean floor
Marine
Polychaetes
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
S UMM ARIZE
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.
Date
S UMM ARIZE
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
Accept all reasonable responses.
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Worms and Mollusks