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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
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