Lab___9_-_Monocots___Dicots

Lab___9_-_Monocots___Dicots - Lab #9 Vascular system,...

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Unformatted text preview: Lab #9 Vascular system, monocots and eudicots Ioana Dobre- Nearly all gymnosperms are woody perennials - Woodiness is associated with the deposition of lignin in the walls of the supportive vascular cells - Lignification first appeared in the ferns and allied plants - Presence of lignin is indicated by the red color of the prepared sections stained with saffrinin Perennial habit > means plant must be able to survive for many years, regardless of climatic conditions Lateral meristem (cambium) permits the plant to increase in diameter Apical meristem increases stem length Stem anatomy in a young conifer- eustele , but soon a ring of secondary xylem surrounds the central pith and itself is surrounded by a ring of secondary phloem => siphonostele configuration- In the outer tissues of the stem, we looked for evidence of a second cambial activity: 1) Cork cambium (a cylinder of meristematic tissue) produces cork cells which form the exterior of the cork cambium. These cells die after maturity maintain a continuous protective cover for the stem as its circumference...
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Lab___9_-_Monocots___Dicots - Lab #9 Vascular system,...

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