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PRIMARY GROWTH, Zone, Zone of cell differentiation, Zone of cell division…

- - - - Buds
      - Leaves
- - - - Cell begin specialize in structure and function
        
        Complete their differentation and cell becoming functionally mature.
    - - Cell elongate
        
        Responsible for pushing the root tip, including the meristem ahead.
        
        Sustain growth by continuosly adding cells to the youngest end of the zone of elongation.
    - - Cell divide more slowly
        
        Act as a reserve that can restore the meristem if it becomes damaged.
        
        Cells are relatively resistance to damage rom radiation and toxic chemicals.
  - - - Ground meristem
        
        These are mostly parenchyma cells between
        the stele and epidermis
        
        They store food and are active in the uptake of
        minerals that enter the root with the soil
        solution
        
        The innermost layer of the cortex, the
        endodermis, is a cylinder one cell thick
        that forms a boundary between the cortex
        and stele
    - - Procambium
        
        Gives rise to the stele.
        
        Roots is a central cylinder of vascular tissue.
        
        Xylem
        
        Phloem
    - - Protoderm
        
        Produces the single cell layer of the epidermis.
        
        Water and minerals absorbed by the plant must enter through the epidermis.
        
        Root hairs enhance absorption by greatly increasing the surface area.