Unit J - Simple Invertebrates
1. Which of the following combinations of organisms contains only radially symmetrical animals?
A. Jellyfish, sponges, and roundworms.
B. Roundworms, hydra, and sea anemones.
C. Sponges, jellyfish, and Portuguese men-o-war.
D. Portuguese men-o-war, roundworms, and flukes.
2. Cephalization MOST ACCURATELY refers to the development of
A. a brain.
B. a head.
C. a scolex.
D. an anterior end.
3. Which pattern of digestive system allows for the greatest organ development?
A. Sac-like pattern.
B. Tube-like system.
C. Gastrovascular cavity.
D. Intracellular digestion by lysosome activity.
4. Which of the following combinations of organisms contains only sessile animals?
A. Flukes and tapeworms.
B. Sponges, hydras, and sea anemones.
C. Jellyfishes, planaria worms, and tapeworms.
D. Flukes, tapeworms, and planaria worms.
5. Animals are diploid (2N) and produce gametes that are haploid (N). This statement is
A. never true.
B. usually true.
C. always true.
D. occasionally true.
6. Sessile aquatic animals are more likely to be
A. radially symmetrical, have separate sexes and reproduce by mating.
B. radially symmetrical, hermaphroditic and reproduce by broadcasting.
C. bilaterally symmetrical, have separate sexes and reproduce by mating.
D. bilaterally symmetrical, hermaphroditic and reproduce by broadcasting.
7. Which of the following correctly describes the water flow through a sponge?
A. In and out through the osculum.
B. In and out through the porocytes.
C. In through porocytes and out the osculum.
D. In through the osculum and out through the porocytes.
8. Which of the following is the most complete list of functions that occur by diffusion in a jellyfish?
A. Excretion and circulation.
B. Respiration and excretion.
C. Respiration and circulation.
D. Respiration, excretion, circulation.
9. Which of the following is true about stinging cells and collar cells?
A. They are homologous structures associated with the digestive system.
B. Stinging cells are specializations of the ectoderm; collar cells are specializations of endoderm.
C. Collar cells are specializations of the ectoderm; stinging cells are specializations of endoderm.
D. Collar cells are members of colonies of cells; stinging cells are specializations of the ectoderm.
10. What are the functions of a gastrovascular cavity?
A. Digestion and excretion only.
B. Excretion and circulation only.
C. Digestion and circulation only.
D. Digestion, excretion and, circulation.
11. Which of the following animals has a nerve net?
A. Sponge.
B. Jellyfish.
C. Planaria.
D. Tapeworm.
12. Which of the following animals is a member of Class Scyphozoa?
A. Hydra.
B. Jellyfish.
C. Planaria.
D. Sea anemone.
