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Phylum Mollusca
Practice Quiz
This practice quiz is a tool to help you study for "real" quizzes and tests. The answers to each question, along with a brief explanation, can be found by scrolling down towards the bottom of the page.

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1. True or False: Members of the Phylum Mollusca are among the structurally simplest multicellular organisms.

2. Molluscs are
a. scavengers
b. deposit feeders

c. carnivores
d. filter-feeders
e. all of the above

3. Which of the following is NOT a characteristic trait of molluscs?
a. a radula
b. a shell
c. a muscular foot
d. tentacles
e. paired gills

4. What is the highest level of organization in molluscs?
a. cellular
b. tissue
c. organ
d. organ system
e. none of the above

5. True or False? The typical molluscan body plan is greatly modified in some of the molluscan classes.

6. Molluscs have which type of symmetry?
a. bilateral
b. no symmetry
c. radial
d. pentamerous
e. cubic

Answers

1. False, molluscs have organ systems and are structurally complex; sponges (Phylum Porifera) are among the structurally simplest multicellular organisms.

2. e, molluscs have a wide variety of feeding styles, including carnivory, filter feeding, deposit feeding, and scavenging.

3. d, molluscs often have a calcium carbonate shell, a muscular foot for locomotion, a radula (a ribbon of small teeth used in feeding), and paired gills to aid in respiration. Although some molluscs have tentacles (such as octopus), the presence of tentacles is not a diagnostic characteristic of molluscs.

4. d, molluscs have an organ system level of organization.

5. true, the typical molluscan body plan is greatly modified in some of the molluscan classes. For example, squid have internal shells and octopuses and a few other molluscs have no shell at all.

6. a, molluscs have bilateral symmetry.

page last updated on 7/15/03

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