Science Notebook - Student Edition

Worms and Mollusks 261

Diversity of

Roundworms

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Rotifers

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Section 25.2 Roundworms and Rotifers (continued)

Main Idea Details

Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

Identify the roundworm that matches each description.

Animal Description

most common roundworm parasite in the U.S.

enters the human body through bare feet

world’s most common roundworm infection

carried by infected, undercooked pork

causes plant diseases

mosquito acts as intermediate host

Identify a negative and a positive effect of nematodes on plants.

Negative:

Positive:

Analyze the cilia of rotifers by completing the graphic organizer below.

Locations:

1.

2.

Uses:

1.

2.

Cilia

Compare the digestive tracts of roundworms with those in free-

living flatworms. What does the comparison suggest about the probable evolutionary

history of roundworms?

(^) CONNECT