Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 31, Problem 4TYK
Summary Introduction
Introduction:
Cnidaria and Ctenophora, the two phyla of soft-bodied organisms, are radially symmetrical (the parts of their body are arranged regularly around the central axis, like the spokes of a wheel) and lack organ systems and coelom. The phylum, Cnidaria (knife: stinging nettle) has nearly nine thousand species. Cnidarians have unique cells in their epidermis called cnidocytes, which is armed with a stinging nematocyst.
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The nervous system of the Hydra is _______ _______ while the flatworm’s is ________ _________.
a. radially symmetrical, bilaterally symmetrical
b. bilaterally symmetrical, radially symmetrical
c. laterally symmetrical, radially asymmetrical
d. bilaterally asymmetrical, radially asymmetrical
Which of the following is NOT a characteristic of annelids?
A.they have a closed circulatory system
B.they reproduce through sexual reproduction
C.there are both male and female earthworms
D.they are able to sense vibrations in the ground
How do body structures and functions of a flatworm compare with those of a cnidarian for
a. sensory responses to the environment?
b. arrangement of the nervous system?
c. obtaining food?
d. movement?
e. excretion of body wastes?
Chapter 31 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 31.1 -
1. What characteristics distinguish animals from...Ch. 31.1 - How does the ability of animals to move through...Ch. 31.2 - What is a tissue, and what three primary tissue...Ch. 31.2 - What type of body symmetry do humans have?Ch. 31.2 - What is the functional significance of the coelom?Ch. 31.2 - Prob. 4SBCh. 31.3 - Which major groupings of animals defined on the...Ch. 31.3 - Prob. 2SBCh. 31.4 - Prob. 1SBCh. 31.4 - Prob. 2SB
Ch. 31.5 - Prob. 1SBCh. 31.5 - Prob. 2SBCh. 31.5 - What do ctenophores eat, and how do they collect...Ch. 31.6 - Prob. 1SBCh. 31.6 - Prob. 2SBCh. 31.6 - Prob. 3SBCh. 31.6 - Prob. 4SBCh. 31.7 - Prob. 1SBCh. 31.7 - If an arthropods rigid exoskeleton cannot be...Ch. 31.7 - Prob. 3SBCh. 31.7 - Prob. 4SBCh. 31 - Prob. 1TYKCh. 31 - Prob. 2TYKCh. 31 - Protostomes and deuterostomes typically differ in:...Ch. 31 - Prob. 4TYKCh. 31 - Which organ system is absent in flatworms (phylum...Ch. 31 - Prob. 6TYKCh. 31 - Prob. 7TYKCh. 31 - Which body region of an insect bears the walking...Ch. 31 - Prob. 9TYKCh. 31 - What is the major morphological innovation seen in...Ch. 31 - Prob. 11TYKCh. 31 - Prob. 12TYKCh. 31 - Discuss Concepts What are the relative advantages...Ch. 31 - Prob. 14TYKCh. 31 - Prob. 15TYKCh. 31 - Prob. 16TYKCh. 31 - Prob. 1ITD
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