Chapter 34

Chapter 34 - Chapter 34(Stem and Transport in Vascular...

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Chapter 34 (Stem and Transport in Vascular Plants) Stems Node Area on stem where leaf is attached Internode Region of stem between two nodes Vascular Cambium Lateral meristem that produces secondary xylem (wood) and secondary phloem (inner bark) Cork Cambium Lateral meristem that produces periderm Cork parenchyma and cork cells Cork Cells Replaces epidermis in a woody stem Cork Parenchyma Primarily for storage in a woody stem Water Movement Water and dissolved minerals move from soil into root tissues (epidermis, cortex) Water and minerals move upward, from root xylem to stem xylem to leaf xylem Water entering leaf exits leaf veins and passes into atmosphere Tension - Cohesion Model Explains rise of water Even in tallest plants Transpiration Evaporative pull causes tension at top of plant. Result of water potential gradient (ranges from slightly negative in soil and roots to very negative in atmosphere) Column of water pulled up through the plant remains unbroken Due to cohesive and adhesive properties of water
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This note was uploaded on 02/29/2012 for the course BIO 123 taught by Professor Druger during the Spring '08 term at Syracuse.

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Chapter 34 - Chapter 34(Stem and Transport in Vascular...

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