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Bess Beetle Tractor Pull

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					Bess Beetle Tractor
Pull Lab
Biology
What are they?
   A beetle commonly found in decaying
    logs from Texas to Florida and as far
    north as Canada
   The mandibles allow the beetle to chew
    through the hardwood that serves as both
    food and shelter
   It will rarely bite the hand that holds it.
   Antennae "drive" the beetle. It is
    assumed that they use their antennae to
    sense odors in the environment—
    decaying wood or other beetles of the
    same species
On a side note…
   During this lab you will be working with a living
    organism. You are to show your beetle respect
    and any beetles harmed or killed during this
    experiment will result in a failing grade.
    Bess beetles have pincers and can pinch,
    however seldom do. When handling your beetle,
    gently hold it on either side of it's abdomen with
    your thumb and forefinger.
    During the lab, talk in quiet voices and try not to
    make any sudden movements that may startle
    your beetle.
Pre-Lab

   Complete the pre-lab.
Materials
   Bess beetles
   Paper towel
   Scotch Tape
   Heavy thread or very fine twine/string
   Scale
   Pennies
   Data sheet
   Smooth surface table top
   Plastic Petri dish
   Ruler
The Main Event

…let’s get ready to rumble!!!
Procedure
1.   Obtain a Petri dish and record it’s weight in
     grams on your lab sheet.
2.   Obtain a penny and record it’s weight on your
     lab sheet.
3.   Place a Bess beetle upside down on it’s back in
     the Petri dish and weigh both. Subtract the
     weight of the Petri dish and record the difference
     as the weight of the beetle.
4.   Place your beetle on it's back on your lab desk
     and measure it's length from tip to tip to the
     nearest millimeter. Place this measurement in
     your data section.
5.   Predict how many pennies the beetle will
     be able to pull on the Petri dish sled and
     write this hypothesis on your lab sheet.
6.   Cut a piece of thread about 20 cm long.
7.   Gently tie a loop of thread around your
     beetle’s body as show below.
8.   Tape the other end to the inside rim of the
     Petri dish.
9.    Place your beetle on the paper towel “track” allowing the
      Petri dish to slide on the smooth lab desk.
10.   When the beetle begins to pull or move the sled by
      walking, slowly add pennies to the sled one at a time,
      until you find the maximum weight the insect can pull. It
      may be necessary to reposition the beetle to prevent the
      sled from touching the cloth or paper. Do not prod or
      push the beetle.
11.   After you have reached the maximum pennies your
      beetle can pull, remove the harness from the beetle and
      return him to your teacher for inspection.
12.   Count the total number of pennies pulled, weigh them,
      and place them in the appropriate place and enter the
      result in on your lab sheet.
10.   Take your dish of pennies and weigh
      them on the digital scale (use a weigh
      boat and tare the scale first). Record the
      weight of the pennies in GRAMS.
11.   Fill in your data into the class data table
      on the board.
12.   Copy the completed data table into your
      lab.
Beetle Number   Beetle Name   Beetle Weight (g)   Number of grams pulled   Length (cm)
      1


      2


      3


      4


      5


      6


      7


      8


      9


     10


     11


     12
 Graph
 Complete Conclusion and Questions
 Turn in your lab! 

				
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