Xylem
- Created by: lauren burgoyne
- Created on: 08-05-13 12:46
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- Structure and distribution of vascular tissue
- vascular bundle made up of 2 main tissues- xylem & phloem
- in stems, xylemarranged in vascular bundlesthat are placed in a ring at periphery-gives flexible support & reisitance to bending strain
- in leaves, arrangement of vascular tissues in the midrib and networkof veins also gives strangth and resistance to tearing tissues
- Structure of xylem
- main cell types in xylem = vessels & tracheids
- Vessels & tracheids form a system of tubes through which water can travel
- As they mature & differentiate, their cellulose cell walls incorporate lignin, which is a very hard, strong substance
- As it builds up around the cell, the contentsdie, leaving an empty space inside
- end walls break down - cells form continuous tube
- As they mature & differentiate, their cellulose cell walls incorporate lignin, which is a very hard, strong substance
- Vessels & tracheids form a system of tubes through which water can travel
- main cell types in xylem = vessels & tracheids
- vascular bundle made up of 2 main tissues- xylem & phloem
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