Study%20Guide%20_%209%20Transport%20in%20Xylem%20and%20Phloem

Study%20Guide%20_%209%20Transport%20in%20Xylem%20and%20Phloem

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Study Guide # 9 J.W. Via General Biology Transport in Plants How do tall plants conduct water from the soil to the forest canopy? Be sure and read chapter 24. It is an excellent chapter and discusses most of the things we will talk about in this lecture? I. Cross Section of the Stem 1) Epidermis- protective covering may have cuticle or bark and may also photosynthesize. 2) Cortex- consists primarily of parenchyma cells, if chloroplasts are present it is called Chlorynchyma 3) Vascular Bundles- contain xylem, phloem and vascular cambium (meristmatic tissue which gives rise to xylem and phloem. Xylem - Elongated lignified cells which have two basic functions in plant 1) Transport of water and nutrients and 2) Support. Unlike most tissues of the plant, these cells are dead at maturity when they function for transport. Three basic types 1) tracheids elongated cells with pits in the ends for movement of fluids. 2) Vessels large elongated cells which have ends that either have large holes or no ends at all (giant soda straws) 3) fiber cells, long cells which do not transport fluids but act for support. In many plants, particularly woody plants , vascular bundles are continuous (form rings) . In Trees, the process of production of vascular tissue is continuous and secondary xylem is laid down to the inside the vascular cambium and secondary phloem is laid down to the outside of the vascular cambium. Seasonality of these growth process results in tree rings in the secondary xylem. Growth Rings of Trees- Spring Wood
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This note was uploaded on 08/15/2011 for the course BIO 1005 taught by Professor Limcomb during the Spring '08 term at Virginia Tech.

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Study%20Guide%20_%209%20Transport%20in%20Xylem%20and%20Phloem

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