SCI 139 - Third Exam Spring 2022



On the line to the left, place the letter of the choice that best answers the question.
Three Points Each.                  NOTE:  "e" answers are never the correct answer.


1.  Which would have a mantle?

_______             a.  Earthworms and marine worms                         b.  Sponge and jellyfish
                             c.  Clam and octopus                                               d.  Tick and mite
                                                                    e.  Animals have fireplaces?

2.  Which basic feature pretty much always is present in animals with bilateral symmetry?

_______            a.   Cephalization                b.  Closed circulation system                            c.   Legs
d.  Wormlike shape                                    e.   An ability to creep us out

3. Which has stinging cells?

_______            a.  Scorpion               b. Squid             c. C. elegans        d.  Hydra
e.  It would be weirder to have stinging bells

4. Animals that produce uric acid as a waste usually also

_______            a.  Have exoskeletons                                  b.  Live on land
                            c.  Make no digestive wastes                      d.  Live in water
e.  Have other disgusting habits

5.   Which has a mesoderm?

_______           a.  Jellyfish                b.  Liver fluke                       c.  Pine tree
                          d.  Fern                                   e.  Is there an ointment for that?


6.  Antennae are found in

_______            a.  Mandibulates and chelicerates
                           b.  Mollusks and segmented worms
       c.  Segmented worms and mandibulates
           d.  Planaria and tapeworms

                            e.  Are these critters listening to satellite radio?

7.  The freshwater oligochaete segmented worms we looked at in the lab
                          are most closely related to

_______            a.  Eels           b.  Roundworms          c.  Tapeworms       d.  Leeches             e.  Linguini 


8.   Which two groups are generally classified in the same supergroup?

_______            a.  Tapeworms & ciliates             b.  Flagellates & amebas         c.  Flagellates & ciliates
d.  Sponges & flagellates                      e.  Flatworms and reality-show participants


9. Which are arachnids?

_______            a.  Roundworms and snakes                        b.  Scorpions and ticks
                       c.  Millipedes and centipedes                     d.  Snails and clams
e.  Tricky, leaving out the one most people know...  


10.  Serial homology is often seen in

_______             a. Digestive systems            b.  Cuticle                  c.  Mollusk feet
                            d. Legs                                    e.  Lucky Charms         


11.  Bilateral symmetry is almost always found with

_______            a.  Radial symmetry             b.  Meristematic growth              c.  Cephalization
d.  Pollen production                      e.  All of the other hard-to-remember terms  


                        12. Both of these come from groups that are all parasites

_______                    a. Toxoplasma and schistosomes                b. Ascaris and leeches
                                    c. Earthworms and tapeworms                    d. Pinworms and anemones

                                       e. Probably a mistake to pick on professions here, but go ahead…



Answer any eight of the following questions for 4 Points Each.
  if you answer more than eight, only the first eight will be corrected.
You can get partial credit on these answers.


1. Give two sets of differences between









 2.  For collar cells -

Where are they


What do
they do?

3.  How is plankton defined?


4.  In general, at what stage are tapeworms most dangerous to hosts?


5.  What are two different behaviors found in insects that are usually thought to only happen in humans?




6.  Give two specific groups from entirely different phyla that do alternation of generations.






7.  What is an open circulation system generally bad at?



8.  What makes something an intermediate host?


9. In insects with indirect development, what are the four stages in order?






10.  What are two different materials that spicules can be made of?




11.  What does it mean if a species is free-living?



 12.  Give the basic function of -





13.  What are chromatophores, and which group has them?



14.  What are two advantages of a tube digestive system over a sac system?






15.  What are the three layers, from the outside in, of both sponges and cnidarians?





16.  People who have had Giardia or amebic dysentery generally don’t get it again.  Why not?




Answer any four of the following questions for Eight Points Each.

  if you answer more than four, only the first four will be corrected.
You can get partial credit on these answers. 

 1.  Give three sets of differences between -















 2.  For four different types of nematodes, give the type of nematode and then give one unique or unusual fact about that particular type
















3. Name and give three sets of differences between the two main body forms in Cnidaria.















4.  Give the three of major subgroups of the mollusks, and for each describe how the mollusk foot looks and/or works in that subgroup.  A labeled diagram is acceptable.











 5.  Give four subgroups of the insects.











6.  For the two main “trunks” of animal classification, give the names that go with each and then two sets of differences between the groups.

 Names -













 7.  Under each of these types of skeleton systems, give two advantages that one has over the other.  Note, this is NOT asking for sets of differences!












Link to Answer Key

Answer as many as you are able.  Wrong answers will not result in points being lost from the main exam.   You can get partial credit on these answers. 

Active cells need to be in a water-based liquid to be active.  Why?  Three Points. 


Why can people who live around water carrying amebic dysentery or beaver fever drink the water without getting sick?  For Three Points, what prevents it? 


How do researchers measure battle strategy in sea anemones?  Three Points. 


Prevagen is a “memory boosting brain supplement” “originally found in jellyfish.”  Why is that a silly claim?  Three Points. 


Jellyfish have three distinct ways that they might kill people.  What are they?  Two Points Each. 


What ability did planaria show in the training experiment that many much brainier animals are not supposed to have?  Three Points. 


What causes the damage during a schistosome infection?  Three Points. 


What local disease is caused by schistosomes?  Three Points. 


What filarial worm affects people (but can’t make them sick) locally?  Three Points.



Michael McDarby.

SC 139