SC 139 - Third Exam 2006
Answer Key

Links on Numbers go to relevant passages in the online textbook.
Unlinked numbers may be purely from the notes or connect to more than one piece of information.

MULTIPLE CHOICE.

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.  Each annual tree ring is made up of a

___B___           a. Good-growth dark ring and a poor-growth light ring
                        b. Poor-growth dark ring and good-growth light ring
                        c. A xylem ring and a phloem ring
                        d. A bark remnant and a growth ring
                        e. Engagement ring and a wedding ring

                ...good growth produces big cells, well-spaced;  poor growth produces packed
                        small cells.

 

2. Which would not have "true" roots?

___A___           a. Moss and fern             b. Fern and pine            c. Pine and maple
                        d. Maple and moss                e. So what, they have root "knock-offs"?

                ...the two most primitive plants paired together.

 

3. Water loss can be reduced with

___D___           a. Root hairs and leaf spaces                      b. Cuticle and open stomates
                        c. Fewer branches and leaf spaces             d. Cuticle and closed stomates
                        e. A switch to pure alcohol - for medicinal purposes only, of course

                ...Cuticle waterproofs, and stomate pores will lose water unless closed.

 

4.  Which would have a mesoderm?

___A___           a. Tapeworm                     b. Jellyfish                     c. Sponge
                        d. Ameba                                 e. Isn’t that a lotion-?

                ...It's a feature that first shows up in this group.

 

5.  Plants use glucose for

___A___           a. Energy and structure                      b. Structure and photosynthesis
                        c. Structure and reproduction             d. Energy and reproduction
                                    e. A good time, but they never call afterwards

                ...Broken down in respiration for energy;  assembled into starches for structure.

 

6.  The presence of sori is an indication that a plant

___C___           a. Will soon produce a flower                 b. Is about to germinate
                        c. Is a true fern                                     d. Will soon "open" its cones
                                e. Needs to be a bit more careful when partnering up

                ...they are the spore-making packets on the undersides of the leaves.

 

7.  In order to be an effective pollinator, a bee needs to make contact with

___C___           a. Both types of flowers                     b. Both types of cones
                        c. A stamen, then a pistil                    d. A pistil, then a stamen
                                    e. A good training and placement service

                ...it has to pick up pollen from the male parts, then transfer it to the female parts.

 

8. Which are sessile?

___B___           a. Ameba and medusa                         b. Sponge and coral
                        c. Hydra and medusa                         d. Ciliate and flagellate
                        e. What they do in the privacy of their own habitat is their business

                ...it means they generally wouldn't move around.

 

9.  In algae, color is often an indicator of

___A___           a. Depth                     b. Pollinators                     c. Fruit type
                        d. All of these                         e. Fashion season

                ...none of the others even apply to algae, which carry different pigments suited
                    to the light frequencies available at different depths.

 

10.  Chlorophyll absorbs frequencies best in which ranges?

___C___           a. Yellow and green             b. Blue and green             c. Purple and red
                        d. Red and Orange                         e. Planty and not-planty

                ...it reflects green, so then you have to choose from the remaining two -
                    if you've seen a plant light, it's easy.

 

11.  Much of the damage caused by schistosomes comes from

___A___           a. The eggs             b. The larvae             c. The host’s allergic reaction
                        d. The adults                    e. People trying to pronounce them

                ...the ones that get into circulation tear things up with their spines.

 

12.  Ameboid cells help most in which process?

___D___           a. Movement                     b. Reproduction                     c. Sensing
                        d. Repair                                     e. Ickyness

                ...they replace lost and damaged cells, moving into their spots and changing
                    into replacement.

 

SHORT ANSWER.

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

1.  What is typically being carried in -
PHLOEM -    Sugars, made in the leaves.

 

XYLEM -  Water and nutrients from the roots.

2.  What does cephalization mean?

      ...it's the evolution of a particular head end, with senses and processors concentrated up front.

 

3. What unique cell type is found in each (but not both)?
Sponges -  Collar cells or choanocytes
                      (used for filter feeding)
Cnidarians -  Stinging cells / cnidocytes /
                  nematocysts (all more-or-less the same)
4.  Why are flatworms flat?

      ...all of their inside cells need to be close to an exchange surface (there's no circulation system).

5.  Name two different types of locations where the trees are much more likely to be gymnosperms than angiosperms.
Higher altitudes.  Up mountains. Higher latitudes.  Toward the poles.
6.  Briefly explain what the term pioneer organism means.

      ...in a "new" environment, these species are the first to live there.

 

7.  What is the basic purpose of any type of fruit?

      ...to get seeds away from the parent plant.

 

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

      ...it exists independently in the environment - basically, it's not on or in another organism.

 

9.  For a typical pine tree, give two sets of differences that would be obvious to someone standing nearby -

MALE
CONES

Higher on tree.

FEMALE
CONES

Lower on tree.
Smaller.
 
Larger.
10.  Give a basic major function of each -
MACRONUCLEUS

       DNA used for day-to-day needs.

MICRONUCLEUS

     DNA is used just to make new nuclei.

11.  What two pre-existing abilities were somewhat combined to evolve pollen?
 Spore production
(waterproof, airborne reproductive packages)
Root growth
(penetrating structures with tubes inside - sperm tubes)
12.  What are two major subgroups of the flatworms?  Either the technical or "regular" names are acceptable.
Turbellaria / Free-living flatworms.

Cestodes / Tapeworms. 

Trematodes / Flukes.
13.  Give the basic process of photosynthesis. (materials can be spelled out - you don’t need chemical symbols)
 Carbon Dioxide  +  Water             Light                   Glucose / sugar   +  Oxygen

         CO2         +       H2O      ----------------->                C6H12O6        +      O2

Ingoing material or materials........Energy...........Outgoing material or materials.

14.  What are two completely different uses that plants have for carotenoids?
Capture light frequencies for photosynthesis

Produce stand-out colors - fruits, flowers.

15.  What are the four subgroups of the protozoa?

Amebas

Flagellates Ciliates Apicomplexans

 

LONG ANSWER.

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

CILIA

FLAGELLA

Smaller

Bigger

Found in large numbers on cell

Usually fewer than 12 on a cell

Don't carry additional structures

May have added structures
Usually act together in coordinated fashion If more than one, often not truly coordinated
Usually have swinging stroke Commonly have spinning action

2.  Give four different sets of differences between - (if some piece differs, be sure to say what piece and how they differ)

MONOCOTS

DICOTS

One-piece seeds

Two-piece seeds

Flower parts are in multiples of 3

Flower parts are in multiple of 4 or 5

Leaf veins are mostly parallel to each other

Leaf veins branch from main central vein

Roots branch out from base, mostly same size
(Fibrous root system)

Roots commonly have big central root with much smaller branch roots (Taproot system)
Stem internal structure without rings Stems may have internal ring structure
Vascular bundles in roots are a ring;  they're scattered randomly in stems Vascular bundles in middle of root, form ring in stems.

3. Many groups use alternation of generations, but there are three different basic reasons for the process. What are those different reasons?
Asexual stage is sessile;  sexual stage allows active mating (as in many cnidaria)

Asexual stage allows wide-ranging spores and good size;  sexual form must be close to the ground for free-water sperm transfer (primitive plants)

Both stages form serious survival issues (flatworm or protozoan parasites)

4.  Give the important steps of a fern’s life cycle. Include the names of the 2 main forms and the types of reproduction used. The lines below are not meant to correspond to the number of steps - it’s like a bit of lined paper.

Sporophyte grows tall.

  Sporophyte produces and releases spores - asexual reproduction.

  Spores, if they fall in the right places, grow into small gametophytes.

  When surfaces are wet, male gametophyte parts release sperm to swim to female gametophyte parts.

  Sexual reproduction produces zygote.

  Zygote grows into sporophyte.

5.  Give four sets of general differences between -

EGG CELLS

SPERM

    Bigger (contain food for embryo)

Smaller

 Made in much smaller numbers 

Made in much bigger numbers
   Must be reached by sperm

Have way of getting to where egg cell is
 From each starting production cell, one egg cell only is made (plus 3 polar bodies). 

From each starting production cell, four functioning sperm are made.

6.  Plants require nutrients other than those used directly in photosynthesis. Give two different examples of these sorts of nutrients, and for each tell something that the plant uses that nutrient for.

Nitrogen - protein production

Phosphorus - ATP, fuel molecule

NO Key for BONUS QUESTIONS.

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.

The growth of algae in many open ocean areas seems to be limited by the low level of which mineral? Three Points.

 

 

Plants produce two types of starches. For Three Points Each, give a purpose for which they make-

Very

STABLE

starches

Less

stable

starches

What does diffusion mean? Three Points.

 

These term parts come from Latin words. For Three Points each, give the "translations" -

Rhiz-

-Phyte

-Zoa

Why, exactly, does peeling a strip of bark all the way around a tree cause the tree to eventually die? Three Points.

 

People who have had beaver fever usually don’t get it again for a while. For Three Points, why?

 

Researchers who study malaria use what sort of animals in their labs? Three Points.

 

For Two Points Each, what sorts of materials can spicules be made out of?

 

In general, why would a parasite alter the behavior of an intermediate host? Three Points.

 

What condition is linked to local schistosomes? Three Points.


 
     

 

Michael McDarby.

 

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