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Botany Week 2 Tisses

by: Madilynn_Danielle

Botany Week 2 Tisses BTNY 11000 - 010

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About this Document

Covers all the different tissues found in plants
Introduction To Plant Science
Peter B Goldsbrough,Robert E Pruitt
Class Notes
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This 2 page Class Notes was uploaded by Madilynn_Danielle on Friday September 9, 2016. The Class Notes belongs to BTNY 11000 - 010 at Purdue University taught by Peter B Goldsbrough,Robert E Pruitt in Fall 2016. Since its upload, it has received 4 views.

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Date Created: 09/09/16
Botany Tissues  Tissues: composed of one or more cell type with specialized functions  Plants develop from a single cell  Primary apical (root and shoot) meristems arise during embryonic development  Secondary meristems (vascular cambium and cork cambium) continue expansion and develop in woody plants during later development (ex. trees)  Tissues are derived from meristems o Also are organized regions of cells of similar structure that preform a collective function  Meristematic Cells: divide and then differentiate into other tissues o thin walls and dense cytoplasm  dermal tissues  ground tissues  vascular tissues  Dermal o Outermost layer of the plant (skin) o Epidermis: is usually a single, exterior layer of flattened cells providing protection  also contains specialized cells that regulate gas exchange- guard cells- controlling the aperture of pores called stomata  frequently also contains trichromes or leaf hairs that have many different functions o Cuticle: multilayered structure secreted by epidermal cells of leaves and stems (outside of epidermis, 7 layers, a way layer aka hydrophobic) o In woody plants, when the epidermis cracks, the cuticle comes in and replaces it  Ground o Parenchyma: living cells comprise the bulk of leaves. Where photosynthesis occurs bc its full of chloroplast o Sclerenchyma: some wall thickening (cellulose) support to young stems, petioles and leaf veins (celery strings)  Vascular o Liquid conducting tissues pf plants o Continuous throughout the plant from roots, through stems and into leaf veins o Water, nutrients, and solutes to move through the plant body  Xylem- moves water and nutrients from roots to shoots o Conducts water and dissolved minerals from the roots to all parts of plants (transpiration)  Pholem- moves sugars (mainly) from sources to sinks o Translocation- of food and metabolities from leaves (source) to flowers, roots, storage organs and meristems (sink) o composed of sieve-tube members (long slender cells with porous ends [sieve plates]) o companion cells aid in translocation  Taxony o Evolution of planta going for a long time o Early plants lacked seeds o Flowering plants are divided into a number of groups based primarily on floral structures o The monocots and dicots are big groups but differ in jobs


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