lab3_plant structure_2007

lab3_plant structure_2007 - Laboratory 3 Plant Structure 54...

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Plant Structure Laboratory 3
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54 Laboratory 3: Plant Structure OBJECTIVES After completing this lab you will be able to: 1. Differentiate between dicots and monocots within the following categories: a. root structure b. stem structure 2. Note differences in the vasculature structure of monocots and dicots 3. Know the differences between monocot and dicot angiosperm flowers LAB PREPARATION In preparation for this laboratory you should do the following: 1. Read and study this laboratory. 2. Read Chapter 35 in Campbell (7 th Edition). 3. Bring your Photo Atlas for Biology to lab. 4. Bring personal protective gear (lab coat, goggles, gloves) to lab. 5. Bring to class four plants (two monocot species and two dicot species) not seen in the laboratory. (They may be whole plants or cuttings.) INTRODUCTION This lab and thre next lab (Lab 4), examine the general morphology, anatomy, and physiology of some typical angiosperms. You can help yourself learn this material by not limiting your observations to the laboratory. The next time you sit down to take a break between classes look around at the plants surrounding you. Ask yourself, Is this an angiosperm Im looking at? If so, What kind is it, a monocot or a dicot? Is it a herbaceous plant or does it exhibit secondary growth? What kind of leaves does it have? Do these leaves show any obvious modifications? What kind of flowers does it possess? How does this plant reproduce? These are just a few of the questions you might ask. Asking questions this way will likely tell you two things: (1) plants CAN be interesting, and (2) there’s no such thing as a typical plant. A. Apical and Primary Meristems Within the germinating seeds you watched grow last week, there were two regions of rapid cell division. One region was located near the base of the plumule (shoot of germinating seedling) and is called the shoot apical meristem (Gk. merizein , to divide). The other region
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Laboratory 3: Plant Structures 55 was located near the tip of the radicle and is called the root apical meristem. These two perpetually young meristems produce three types of primary meristems: protoderm, ground meristem, and procambium. These primary meristems are the first three specific tissues formed in the embryo. The term primary refers not to first, but to primary growth - the growth in length, as opposed to secondary growth , which is growth in girth. As the young sporophyte continues to grow, these primary meristems divide, giving rise to even more specific tissues. However, before discussing specific plant tissue types, we will review the types of cells that make up these tissues. B. Common Plant Cell Types 1. Parenchyma A parenchyma cell is the kind of cell you probably envision when you think of a typical plant cell. It is a living, relatively undifferentiated cell with a nucleus, normal cytoplasm, and only primary (abbreviated as 1 o ) cell walls that are non-lignified. (Lignified
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This lab report was uploaded on 04/10/2008 for the course BIO 172L taught by Professor Gerald during the Spring '08 term at Hawaii.

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lab3_plant structure_2007 - Laboratory 3 Plant Structure 54...

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