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Plant Structure and Growth
Concept 2: Plant Cell Structure    Review (1 page)
Concept 5: Ground Tissues
   Review (2 pages)
Concept 6: Vascular Tissues
   Practice (1 page)
   Review (2 pages)
Concept 7: Primary Growth
Concept 8: Primary Growth of Stems
   Practice (1 page)
Concept 9: Structure of Young Stems
   Practice (1 page)
Concept 11: Structure of Young Roots
   Practice (1 page)
Concept 13: Leaf Structure
   Practice (1 page)
Concept 16: Structure of Woody Stems
   Practice (2 pages)
Concept 7: Primary Growth
Primary growth is the lengthening of the stem and roots.
All plant growth occurs by cell division and cell elongation. Cell division occurs primarily in regions of undifferentiated cells known as meristems.

Cell division in the apical meristems and subsequent elongation and maturation of the new cells produces primary growth.

The other type of growth, secondary growth, is the increase in girth of stems and roots.
Primary Growth and the Location of Apical Meristems Cell Elongation
Animate

Animate

Notice that the internode distance increases during primary growth (elongation), but then this distance becomes set.