lab07 - 7-1 SPRING 2010 NAME...

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Unformatted text preview: 7-1 SPRING 2010 NAME _______________________________ BTNY21SECTION (DAY/HOUR)______________________ LABORATORY #7(STEM, ROOT AND LEAF ANATOMY) Lab # 7 Objectives:1) build upon your understanding of stem anatomy by studying its structure in greater detail from last week 2) become familiar with the structural differences between primary growth and secondary growth in dicot stems 3) learn and recognize the basic structure of roots and leaves and the primary tissues that comprise them Begin with some review: a) Where does primary growth occur and when during a plants development? b) Where does secondary growth occur and when during a plants development? A. PRIMARY TISSUES AND CELL TYPES OF STEMS 1. Dicot stem structure We are going to start this week by examining dicot stem structure in detail. Consult textbook chapter 9 on pages 150-168. We will be using the same prepared slides of Medicago(alfalfa) stems that we used last week. Be sure to use the MIDDLEset of cross sections for this, because these are sections from stems with mature primary growth. Look at an overview of the stem at low magnification. Find a vascular bundle and study it under high power (20 or 40X objective). a) On the image at the top of the next page label the following tissues: epidermis, cortex, primary phloem, primary xylem, andpith. Undifferentiated cells located between the primary xylem and primary phloem are residual procambium. Finally, label parenchymaand collenchymacells (remember the characteristic position of collenchyma). 7-2 Part of a cross section of an alfalfa stem: b) What is the function of the primary phloem fibers? c) What is the function of the residual procambium? d) Within the cortex there are two cell types. One cell type you labeled for bin the photomicrograph. What is the other cell type found in the cortex? e) What is a major function of these cells? (Think about their position within the stem and their cell contents compared to cells within the pith.) 7-3 2. Monocot stem structure Now look at a cross sectionof the stem of corn, a monocot. Find a vascular bundle and study it under high power (20 or 40X objective). a) Label the following tissues: primary phloem, primary xylem andthebundle sheath, composed of sclerenchyma cells, which encircles the entire vascular bundle.The vascular bundle is surrounded by ground tissue composed of parenchyma cells....
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This note was uploaded on 02/23/2012 for the course BTNY 210 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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lab07 - 7-1 SPRING 2010 NAME...

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