University of Rio Grande

Invertebrate Zoology Bio 33404

Sample Exam 4

This sample test is meant to give you an idea of the types of questions that will be on the exam. Simply memorizing the answers to these questions will not get you a good grade on the exam. You should consider these questions as well as related questions.

Multiple choice : Chose the BEST answer to each of the following questions. There will be 60 questions of this type on the exam. Each question is worth 1 points. Here are 18 examples.

1. The only lophophorates found in freshwater are
a. Brachiopods b. Bryozoans c. Entoprocts d. Phoronids

2. Which of the following is a bryozoan?
a. Amphioxus b. Bugula c. Lingula d. Terebratella

3. All of the following are unique to echinoderms EXCEPT
a. dermal ossicles b. mutable connective tissue
c. radial symmetry d. water vascular system

4. The region on an echinoderm where the tube feet occur is the
a. aboral b. ambulacral c. evisceral d. podial

5. All of the following are differences between a sea urchin and a sand dollar EXCEPT
a. sea urchins are spherical and sand dollars are flattened
b. sea urchins have an aboral anus and sand dollars have an oral anus
c. sea urchins have spines and sand dollars do not
d. sea urchins do not have petaloids and sand dollars have petaloids

6. Brittle stars belong to the group
a. Asteroidea b. Crinoidea c. Echinoidea d. Ophiuroidea

7. Tunicates are members of the group
a. Cephalochordata b. Echinodermata
c. Hemichordata d. Urochordata

8-10. Match the following
____8. Sessile adults
____9. Barrel-shaped swimming adults
____10. Adults with tail and notochord

a. Ascidiacea
b. Larvacea
c. Thaliacea

11. The main characteristic the Hemichordata phylum has in common with chordates is
a. notochord b. pharyngeal gill slits c. neotony d. proboscis

12. The mucus secreting region of a chordate pharynx is the
a. atrium b. endostyle c. notochord d. tunic

13-15. Match the following
____13. forms the gut lining
____14. forms the skin and nervous system
____15. forms the muscle

a. ectoderm
b. endoderm
c. mesoderm

16. If an animal can be cut into two equal halves along only one plane it is
a. asymmetrical b. bilaterally symmetrical c. radially symmetrical

17. Trachea are the predominant respiratory mechanism in
a. Starfish b. Insects c. Clams d. Earthworms

18. The change in the genetic composition of a group of organisms over time is called
a. cladistics b. evolution c. natural selection d. phylogeny

 

Essays (60 points): This section consists of 6 essay questions worth 10 points each. Here are three examples.

1. (10) Describe or draw the components of the starfish water vascular system. Be sure to label the parts of the drawing or include the part names in your description.

 

2. (10) Name and describe the three (3) distinguishing features of a chordate. Also list at least 3 other characteristics that all chordates have in common.

 

3. (10) Draw three (3) labeled diagrams showing the difference between an acoelomate, a pseudocoelomate and a eucoelomate. Be sure to label the 3 different tissue layers and the cavities. For each, list 2 phyla that have that structure.

 

Identification (30 points) This section consists of 12-16 stations each with 1-3 questions. Observe the organisms at each of the stations and answer the questions indicated next to the sample. Below are a few samples using photos. The exam with have microscopes with slides and lab specimens for most.

1. To what genus does this animal belong?

2. The striped appearing section to the upper left is which organ?

 

3. What is the genus name of this animal?

4. Wht is the U-shaped upper structure?

 

5. Identify these structures

 

6. To what phylum does this animal belong?