General Biology: BI101 Spring, 2007
ANSWER KEY STUDY QUESTIONS: Ch 22
1. Which of the following correctly describes animals?
b. heterotrophs
2. A group of similar cells performing a function is a(n):
c. tissue
3. The cells of animals:
d. , a, b & c are correct
4. The vast majority of animals:
d. lack a backbone.
1. The animal phylum characterized by the absence of tissues is:
d. sponges.
2. Organisms that can be divided into equal halves on many planes through their central axis have _____ symmetry.
b. radial
3. An animal phylum characterized by radial symmetry is:
c. cnidarians..
4. A true body cavity that develops in the mesoderm is a:
a. coelom.
5. All of these animal phyla have coeloms except:
b. nematodes or roundworms.
6. In protostomes, the _____ develops from the blastopore.
a. mouth
7. The two phyla characterized by deuterostome development are:
c. echinoderms and chordates..
1. Which of the following is NOT a characteristic of most animals?
c. delayed response to external stimuli
2. Which of the following characteristics is NOT shared by plants and animals?
d. heterotrophs
3. Which of the following distinguishes animals from fungi?
c. Animal cells lack a cell wall.
4. How does "radial symmetry" differ from "bilateral symmetry"?
b. Radially symmetrical animals can be divided into symmetrical halves with any plane through the central axis. Bilaterally symmetrical animals can be divided into equal halves by only one specific plane through a central axis.
5. How many planes through the central axis will divide an organism with bilateral symmetry into roughly equal halves?
b. two
6. Body symmetry is an important criterion for classification purposes. Label the diagrams below indicating plans of symmetry and orientation. Label A: plane of symmetry
Label B: anterior
Label C: posterior
Label D: central axis
Label E: plane of symmetry in a radially symmetrical anima
7. Among animals with a fixed body shape, those that are elongated, such as earthworms or scorpions, have which type of symmetry?
b. bilateral symmetry
8. Animals that have concentrations of sensory organs (or even brains) in a well-defined head are a result of the evolutionary process called _____ cephalization ______.
9. An animal with cephalization will have which of the following?
c. sensory cells/organs and nerve cells clustered at the anterior end of the animal
10. Which of the following is NOT a function associated with a body cavity?
b. digestion
11. Which of the following is an example of a coelom?
b. a fluid-filled cavity
12. Species of which of these phyla have a pseudocoelom?
a. Annelida b. Arthropoda c. Mollusca d. Nematoda e. Platyhelminthes
13. Species of which of the following animal phyla are deuterostomes?
f. Both the third and fourth answers are correct.
14. Which of the following is NOT associated with sponges?
b. connective tissue
16. The phylum Porifera shares a similar body plan throughout. Label the structures of this body plan in the diagram below. Label A: osculum Label B: pore Label C: collar cell Label D: spicules Label E: epithelial cells Label F: amoeboid cells
17. Although Cnidarians have both a polyp and a medusa body form, these two share common structures. Label these structures in the figure above.
Label A: mouth Label B: body wall Label C: gastrovascular cavity
Label D: tentacle Label E: mesoglea
18. What are the two functions of the gastrovascular cavity of a cnidarian?
c. digestion and distribution of nutrients
19. A gastrovascular cavity, with a single opening, is the characteristic digestive system of animals in which phylum?
d. Platyhelminthes
20. Which of the following is associated with or characteristic of a parasitic flatworm like a tapeworm?
a. hooks and suckers
22. Some worms (such as flukes) possess both male and female reproductive organs. Flukes are considered ____hermaphrodites______ because of this trait.
24. Animals in which of the following phyla are segmented?
e. Both the first and second answers are correct.
25. Annelids (segmented worms) have many structures comparable to those observed in vertebrates (like you). Which of the following is a vertebrate structure to which there is nothing comparable in an annelid?
d. teeth
26. Label the typical annelid structures on the earthworm shown on the above.
Label A: hearts Label B: mouth Label C: brain Label D: esophagus
Label E: crop Label F: pharynx Label G: gizzard Label H: coelom
27. Which of the following is NOT a mollusk?
a. barnacle
28. The success of the cephalopods as predators is supported by the presence of ______.
e. all of the above
29.On the left is a diagram of a typical mollusk. Label the structures indicated.
Label A: brain Label B: coelom Label C: heart
Label D: gonad Label E: radula Label F: foot
Label G: mantle
30. Arthropods are a highly diverse, successful, and fairly complex group of invertebrates. Which of the following evolutionary trends is associated with the arthropods?
d. cephalization
31. Shedding an old, small exoskeleton to allow a larger one to grow is called ____molting______.
32. Insects have a stage that is non-feeding and persists through metamorphosis. An insect in this stage is called a ______pupa______.
33. Arthropods have a typical body structure exemplified by the grasshopper on the left. Label the structures indicated.
Label A: head Label B: compound eye Label C: antennae Label D: thorax Label E: abdomen
Label F: mouth parts
BI101SQA Ch22.doc 4 5/23/2007