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Leaf Structure
leaf structures
6
Biology
9th Grade
06/02/2008
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Term
epidermis
 Definition
the outer cell layer
Term
palisade layer
 Definition
the upper most internal layer, where most of the photsynthesis occurs
Term
spongy layer
 Definition
loosely packed photosynthetic cells with air spaces bewtween for gas movement
Term
veins
 Definition
contain the vascular tissues-- xylem and pholem
Term
guard cells
 Definition
these control the opening and closing of the stoma- this helps the plant regulate transpiration
Term
transpiration
 Definition
the evaporation of water out of the plant
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