Plant Body Page 3

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IV.  Primary Root Growth

A.  Root Apical Meristem
     1.  Promeristem
     2.  Root Cap
     3.  Quiescent Center
     4.  Protoderm -> Epidermis
     5.  Ground Meristem -> Cortex
     6.  Procambium
        -> Endodermis + Pericycle
            +Primary Xylem + Primary Phloem

B.  Zones of Cell Activity
    1.  Cell Division + Cell Elongation
        a.  Perpetuates Promeristem
        b.  Gives rise to Cells of Root Cap and Root Body
    2. Cell Elongation
        a.  Plant Cells don't migrate or slide past one another
        b.  As cells elongate the root apical meristem is pushed
            deeper into  the soil
    3.  Cell Maturation
        a.  Root Hair Formation from Epidermis
        b.  Lateral Root Formation from Pericycle         c.  Secondary Xylem and Secondary Phloem from Vascular
                      Cambium and Pericycle
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