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Roots (other functions: (some roots grow horiz. (produces shoot buds, act…

- - - - harden to sharp spines
  - - - hold to rocks&bricks
- - - - resulting in highly-branched root sys.
  - - - allows increase in # of leaves&absorptive roots
      - ups xylem in trunk and roots
    - - after stem formed, conducting capacity can't be upped
      - formation of adventitious roots
- - - - xylem in center
      - phloem around xylem
      - no pith present
- - - - controls minerals entering xylem
- - - - just behind is zone of elongation
        
        these cells undergo div.of expansion
      - root hair zone
        
        epidermal cells extend as trichomes
        
        increase root's surf.area
      - root cap layer closest to root meristem=meristematic
        
        files of cells pushed up
        
        edge cells grow on side
- - - - extend to regions of mature root tiss.
      - quiescent center
        
        replaces AM if damaged
        
        mitotically inactive central region