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7 Science Chapter 12

bark rough outer covering of a tree & location of a tree's phloem
block cutting removing all the trees in areas 100 acres or less
bottomland hardwood forest American forest region extends along the Mississippi River
bristlecone pines oldest living organisms on earth
canopy forest's thick top layer of interlaced leaves
carbon source the technical term for a system of object that produces carbon dioxide
coast redwood tallest tree species
crown top leafy portion of a fully grown tree
crown fire most destructive type of forest fire
cuticle waxy protective layer on a leaf
deciduous a tree that loses its leaves in the fall and stays bare all winter
dioecious a tree that produces male and female reproductive parts
gall abnormal tree growth caused by insects
hardwood another name for broadleaf trees
heartwood the hard, dead, clogged wood at the center of a tree
leaf scar all that remains on a branch after a leaf falls off
lenticel small pore that allows air to enter a stem
node place on a stem that leaves grow out of
old-growth forest forest that has not been influenced by man or used for timber
Pinchot first head of the U.S. Forest Service
pith central core of a young woody stem
prescribed burning foresters deliberately setting fire to a forest under controlled conditions
sapling a young tree
sapwood a tree's living, functioning wood
secondary forest type of forest that grows up after a virgin forest is cut
secondary growth a tree's increase in diameter
seed-tree method removing all but a few selected trees from a certain area
silviculture branch of forestry that deals with the care and culture of forest trees
spreading branching tree with several main branches close to the ground
stands groups of tall plants or trees
sun leaves thick, small leaves at the tops of trees
supertrees crossbred trees that are more insect resistant and produce better wood than normal trees
sustained yield intensive forest management system that is intended to cause forests to grow more high-quality trees that mature more quickly than normal
taproots or spreading roots type of tree roots
terminal bud location from which a tree grows in length
tree a perennial plant which is at least 20 feet tall and has a single main stem
tree line northern and southern limit at which trees grow
tree roots part of tree which functions include absorbing water & minerals, making food for the tree, and storing food
vascular cambium layer of growth cells just below the bark of a tree
wood main tissue of a trunk
xanthophyll leaf pigment that gives leaves a yellow color
xylem tissue that wood is composed of
abscission layer layer of cells that forms at the bse of a petiole to sever a leaf from a branch
annual growth ring one layer of springwood and one layer of summerwood
Created by: Mrs_CC