Ch 35-39 investigation

Ch 35-39 investigation - Ch 35 Activities and...

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Ch. 35 Activities and Investigations: Activity : Root, Stem, and Leaf Sections Epidermis – the outer layer of cells surrounding the root. Many of the epidermal cells of the root bear extensions, known as root hairs, that increase the surface area for the absorption of water and dissolved minerals from the environment. Cortex – the parenchyma cells lying between the epidermis and the vascular tissues constitute the cortex of the root. The stems of most herbaceous dicots are composed of several different kinds of simple and complex tissues and exhibit a very characteristic structure when viewed in cross section. Epidermis – The outer layer of cells surrounding the stem. Cortex – The cells lying between the epidermis and the vascular tissues constitute the cortex of the stem. Most of the cortical cdells are parenchyma, but there may be one or more layers of collenchyma lying immediately beneath the epidermis. Pith – The central portion of the stem is filled with parenchyma cells that have very distinct intercellular spaces; this region is collectively known as the pith. Vascular Bundles – Separating the pith from the cortex is a ring-shaped arrangement of structures known as vascular bundles. Each bundle represents a longitudinal strand running the length of the stem and containing two different kinds of complex tissues, the vascular, which are responsible for the transport of materials throughout the plant body. Xylem – A complex tissue composed of parenchyma cells, sclerenchyma fibers, and two kinds of specialized water-transport cells, tracheids and vessel elements. Phloem – A complex tissue composed of parenchyma cells, sclerenchyma fibers, sieve tube members, and companion cells; this tissue type is specialized for the transport of dissolved organic materials throughout the plant.
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The basic structure of herbaceous monocot stems is very similar to that of herbaceous dicot stems. In cross section, you should be able to identify the epidermis, supporting layers of collenchyma tissue, the ground tissue composed of parenchyma cells, and the vascular bundles.
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This note was uploaded on 10/01/2011 for the course BIOLOGY 1510 taught by Professor --- during the Spring '11 term at Georgia State.

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Ch 35-39 investigation - Ch 35 Activities and...

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