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CHIMERA
(ki mer' a)
Chimera - a plant or plant part composed of genetically different layers.
The most common example is a "variegated" plant where different regions or layers of the leaf are yellow or white due to no chlorophyll development, i.e. these are chlorophyll mutants. 
  
GROWING POINT OR APEX - can be subdivided into 3 different layers 
Layer Gives rise to:
L-I
epidermis of all organs; 
monocot leaves - L-I  contributes to the outermost region of the leaf mesophyll giving 
                          rise to a strip along the leaf margin. 
dicot leaves - L-I usually gives rise to only the colorless epidermis, thus cannot be seen; 
                     sometimes L-I gives rise to small islands of tissue along the margin.
L-II
stem and roots: outer and inner cortex and some of vascular cylinder 
leaves: mesophyll in outer region of leaf
L-III
stem and roots: inner cortex, vascular cylinder and pith 
leaves: mesophyll in central region of leaf 
                  LOCATION OF LAYERS IN A TYPICAL DICOT