DR 27-2 Animal Body Systems

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Skills Worksheet
Directed Reading
Chapter 27 Section 2 Pages 604-610
Section: Animal Body Systems
In the space provided, explain how the terms in each pair differ in meaning.
1. gastrovascular cavity, digestive tract
2. gills, lungs
3. open circulatory system, closed circulatory system
4. exoskeleton, endoskeleton
5. excretion, digestion
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Holt Biology
5
Introduction to Animals
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Directed Reading continued
In the space provided, write the letter of the description that best matches the
term or phrase.
______ 6. respiratory system
______ 7. digestive system
______ 8. circulatory system
______ 9. hydrostatic skeleton
______10. excretory system
a. enables digestion of foods that are larger
than individual cells
b. consists of water that is contained under
pressure in a closed container
c. takes in oxygen and releases carbon dioxide
d. removes wastes produced by cellular
metabolism
e. transports oxygen and nutrients
Complete each statement by underlining the correct term or phrase in the brackets.
11. Parthenogenesis is an example of [asexual / sexual] reproduction.
12. Species of animals that have both testes and ovaries are called
[hermaphrodites / asexual].
13. A sponge can reproduce by [fragmenting / fertilizing] its body.
14. Animals that live on land usually reproduce by [internal / external] fertilization.
Copyright © by Holt, Rinehart and Winston. All rights reserved.
Holt Biology
6
Introduction to Animals
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