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Meristem Morphology
Creation of cells by meristem
18
Biology
Undergraduate 1
10/26/2010

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Term
Apical Meristem
Definition
site of cell division through mitosis
Term
Mitosis
Definition
Splitting of cell to create 2 identical cells
Term
Leaf Primordia
Definition
Surrounds apical meristem on either side @ tip
Term
Initial Cells
Definition
Meristem cells that remain meristematic; continue to initiate new cells.
Term
Dirivative Cells
Definition
Cells that undergo mitosis 2X or more and then differentiate
Term
Girth vs. length
Definition

Length=outcome of cell division/enlongation

Girth=outcome of mitosis/differentiation (the fatness of stem)

Term
Fasicular Cambium
Definition
Area b/w xylem (inside) and phloem (outside) in young shoots
Term
Interfascular Cambium
Definition
Differentiated cortex parenchyma; creates 'ring' that surrounds vasc bundles; create 2ndary xy/ploem
Term
Periclinical Division
Definition
creation of new cells that add girth to shoot; eventually differentiate to xylem and phloem; (cell wall seperating cells is parallel to outside of plant)
Term
Anticlinical Division
Definition
Addition of perpendicular-to-surface cells that add to size of interfascular ring to keep from bursting
Term
Cork Cambium
Definition
Provides protection around expanding trunk; develops after start of 2ndary xy/phloem
Term
Phelladerm
Definition
New cells that Cork cambium lays down toward inside; differentiates into cork cells
Term
Devices in cork that allow for H20 proofing/gas exchange?
Definition
Suberin (H20 proofing) and Lenticles (holes that allow H20/gas exchange)
Term
Bark
Definition
primary/secondary xy/phloem, phelladerm, cork cambium, cork
Term
Annual ring creation
Definition
As season progresses, xylem cell wall becomes thicker and diameter decreases; in spring this becomes thing walled, creating different looks
Term
Heartwood
Definition
Dark area in annual ring; older w/ limited H20 transportation
Term
Sapwood
Definition
Younger, lighter; actively transports H20
Term
Root apical meristem
Definition
include vascular (from root parenchyma b/w xy/phloem) and cork cambium;
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