Notes 10-31-08

Notes 10-31-08 - Dermal Tissue-skin of the plant; the...

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Monocot-1 cotyledon (parallel veins, such as those in a banana leaf) Eudicots-2 cotyledons Vascular tissue (long distance) Xylem-water Phloem-sugar Ground tissue-bulk of weight Primary cell wall-cellulose Secondary cell wall-lignin (thickening and strengthening, and do not continue growth later on) 3 main types of ground tissue parenchyma-primary cell wall (active cells, capable of further division, can repair) collenchyma-strengthening (leaf petioles/stalk) primary cell wall, tissue still in the process of growing, can add strength even when tissue is immature (example: celery, which is the collenchyma of a leaf) sclerenchyma-primary and secondary cell wall (ex. Nut); lots of strength 2 kinds of sclerenchyma tissue -sclerids=round cells like those that make up nuts -fibers=give strength
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Unformatted text preview: Dermal Tissue-skin of the plant; the epidermis-single cell layer thick-may have a waxy covering-cuticle-trichomes (leaf hairs) on trichomes rooth hairs (increase surface area) & leaf trichomes (bulbous shaped cells which can give leaf surface hairy to reflect light in a too lit environment; herbivry reduces the amount animals eat it; can be composed of chemicals such as stinging nettle) vascular tissue in the stem vs the root eudicot stem-bundles of vascular tissue sorrounding the xylem and the phloem, region of the stem inside the vascular tissue = pith (not packed too tight together) eudicot root monocot stem-vascular tiisue scattered, not on the permiter like eudicots, outside part is phloem, inside part is xylem...
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