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28 Cards in this Set

  • Front
  • Back
basic unit of all living things
cell
cytoplasm
jellylike stubstance that fills much of the cell; contain other cell structures
chloroplasts
where food making occurs; contains chlorophyll
cell wall
touch outer covering of a plant cell
cell wall
gives plants a rigid shape; made of cellulose
cell membrane
thin layer that surrounds all cells
cell membrane
allows water and dissolved materials to pass in and out of the cell
nucleus
controls all the cell's activities; very important in cell reproduction
vacuole
large storage area filled with fluid that holds varoious subtances including fool
spring and summer
when new growth of sylem and phloem cells occur in the trunk
cell size
varies with the amount of rain
xylem cells
formed in drier summer months
annual rings
the rings in a tree bark the result from a seasons growth
annual rings
tell how how a tree is
sapwood
living xylem cells that give the tree support and strength;
sapwood
makes up most of the tree's wood
cambium
thin growing layer of living cells
cambium
produces phloem cells near the trunk's outer part
cambium
produces xylem cells toward the trunk's center
outer bark
protective covering of a tree; like skin
outer bark
protects tree from disease and from drying out
heartwood
innermost part of a tree
heartwood
old dried up layers of xylem
rotten heartwood
causes big holes in trunks of trees
annual rings
tell story about the weather conditions that tree survived
narrow annual rings
result from periods of drought
wide annual rings
result from wet periods
2.5 cm (1 in)
average increase in tree width each year