Spring.wmf (18300 bytes) Plant Physiology (Biology 327)  - Dr. Stephen G. Saupe;  College of St. Benedict/ St. John's University;  Biology Department; Collegeville, MN  56321; (320) 363 - 2782; (320) 363 - 3202, fax;    ssaupe@csbsju.edu

PreLab:  Leaf Shape Lab

  1. Print copies of the lab exercise, pre-lab, tracing technique, and post-lab.  Bring to lab.

  2. Print two copies of the images for your assigned leaf sample (files below, black/white is fine).

  3. Read the lab exercise. 

  4. Complete Table 1 - Predictions/Hypotheses and bring it to lab.  For each of the following: (1) select your hypothesis; and (2) provide a written the rationale for each prediction. 

  5. Not required, but it will save you time in lab:  using one of the two copies you printed of your assigned leaf images, cut out each leaf as precisely as possible, and bring the cut out leaves to lab.

 

Prediction

Rationale:
1 Summer herbs have (larger / smaller) leaves than spring herbs

 
2 Leaf petioles are (longer /shorter) in spring herbs than summer herbs

 
3 Spring herbs will have a (greater / lower) frequency of compound and dissected leaves than summer herbs

 
4 Herbs will have a (greater / lower) frequency of compound and dissected leaves than trees  
5 Spring herbs will have (thinner/thicker) leaves than summer herbs

 
6 Trees will have (thicker/thinner) leaves than herbs

 
7 Petioles of leaves will be longest in an environment:
     (a)  with lots of sun, high light
     (b)  that is shady

 
8 Leaves will be thickest in plants in an environment that is: 
     (a) wet   (b) dry

 
9 Leaves will be thinnest in plants in an environment that is: 
     (a) sunny (b) shady

 
10 Leaves on a given tree will be thickest:
     (a) to the outside/top of the canopy 
     (b) to the inside/bottom of the canopy

 
11 On an individual tree, lobes will be most prominent in leaves:
     (a) to the outside/top of the canopy
     (b) to the inside/bottom of the canopy

 
12 Leaves of the trees in a deciduous forest will have a shape more similar to herbs that grow in the:
     (a) spring  (b) summer

 
13 In which habitat would you expect the leaves of the herbs to most look like the tree leaves:
     (a) deciduous forest  (b) rain forest

 

 

 

Digital Leaves:  the specimens that we will use in this lab have been scanned.  Copies of the files are below.

1 2 3 4
       
5 6 7 8
       
9 a 9b 10 11
       
12a 12b 13a 13b

 

 

| Top | SGS Home | CSB/SJU Home | Biology Dept | Biol 327 Home | Disclaimer |

Last updated:  01/07/2009     � Copyright  by SG Saupe

Last updated:  01/07/2009               � Copyright  by SG Saupe