BIO 104 4/15/96

Labratory Preparation Lecture #2

 I. Introduction
II. Vascular Tissue
     -used for support
     -used for transport of H2O and minerals
     A. Xylem and Phloem
          -Xylem transports H20 and minerals
          -Phloem transports sugars and products of 
               photosynthesis
     B. Water needed for:
          1) support
          2) transport
          3) cell fuctions (like being a catalyst for reactions)
          4) photosynthesis
     C. Water transport
          -transpirations:
               -water loss from leaf of the plant
               -water pulled in by roots then taken 
                 through plant by xylem and exits the 
                 plant through stomata
               -stomata 
                    -gas intake and water loss
               -Cohesion-adhesion-tension theory
                (transpiration pull theory)
                    -similar to a person sucking on a 
                      straw
     D. This Week in Lab
          -4 treatments
          -TA's will set up the plants, and you will
            measure the plants every 10 minutes
          -Look at structure of the stem
               -need to find the xylem, phloem, and
                 epidermis (see page 40 in lab)
          -Differences between monocots and dicots
               -Monocots stem have vascular bundles which are scattered.
               -Dicots stem have vascular cambium,
                 and the vascular bundles are in a 
                 circle
                    -dicots are able to grow larger
                      due to the stem
          -Know this for lab 
               1) stem structures
               2) Seeds (starch)
                    -amount of starch in seeds
                    -in lab you will stain both monocot
                      and dicot seeds to see where the starches are
               3) Leaves
                    -monocots=parallel
                    -dicots=netted
               4) Flowers
                    -know the difference between monocot and dicot flowers
     E. Growth
          1) Dicots have two cotolydons, while monocots have 1
               -know specific parts of the seed
          2) Twigs and trees
               -be able to age the leaves and twigs

     Know:     Vascular tissue
               Cohesion theory
               Growth
               Monocots and Dicots
     
     Ways to decrease transpiration:
          -smaller leaves
          -stomata (length of time open and when)
          -covering on leaves
          -direction the leaves face 
          
     READ YOUR LAB BOOK BEFORE GOING INTO LAB