9/21/11 (WED) : LAB 9/21/11 (WED) : LAB THE MISSING LINKTHE MISSING LINK

Describe how Describe how dichotomous keys help dichotomous keys help

in identifying in identifying organisms.organisms.

OBJECTIVEOBJECTIVE

Students will use common Students will use common nails, screws, and bolts to nails, screws, and bolts to

simulate the process of simulate the process of applying classification to applying classification to living organisms or fossil living organisms or fossil

life forms.life forms.

PURPOSEPURPOSETo collect, analyze, and To collect, analyze, and

interpret information interpret information about objects in order to about objects in order to

classify them using a classify them using a dichotomous key.dichotomous key.

PART 1PART 1Classify your hardware Classify your hardware organisms into groups. organisms into groups. Sketch, label and name Sketch, label and name each organism you have each organism you have

classified and then list the classified and then list the common characteristics of common characteristics of

each of your groups.each of your groups.

PART 2PART 2Create a dichotomous key Create a dichotomous key

(using series of paired (using series of paired statements) to identify the statements) to identify the

hardware organisms hardware organisms “Dichotomous Key to 12 “Dichotomous Key to 12

Common Hardware Common Hardware Organisms” (Pg. 226 in Organisms” (Pg. 226 in

txtbk)txtbk)

TO BEGIN . . .TO BEGIN . . .1)1) Take objects out of bag Take objects out of bag

and count them (12).and count them (12).

2)2) Put into two groups Put into two groups (shape of head - flat (shape of head - flat

round).round).

3)3) Sketch and label with Sketch and label with appropriate name.appropriate name.

HARDWARE HARDWARE ORGANISMS . . . ORGANISMS . . .

A.A. NAILNAILB.B. FLAT-HEAD WOOD SCREW (GREY)FLAT-HEAD WOOD SCREW (GREY)C.C. FLAT-HEAD DRY WALL SCREW (BLACK)FLAT-HEAD DRY WALL SCREW (BLACK)D.D. WHITE PLASTIC SCREW ANCHORWHITE PLASTIC SCREW ANCHORE.E. ROUND-HEAD SCREWROUND-HEAD SCREWF.F. FLAT-HEAD SCREWFLAT-HEAD SCREWG.G. METAL SCREW ANCHOR METAL SCREW ANCHOR H.H. NUT WITH BOLTNUT WITH BOLTI.I. LARGE/TINY SCREWLARGE/TINY SCREWJ.J. VERY LONG/SHORT SCREW/BOLTVERY LONG/SHORT SCREW/BOLTK.K. VERY BIG SCREW/BOLTVERY BIG SCREW/BOLTL.L. WASHERWASHER