Forest & Trees Flashcards
simple
one leaf on the petiole
compound
more than one blade on petiole
double compound
there is a main petiole with several other petioles with multiple leaves on the secondary petioles
needle
look like needles - usually on coniferous
what are the four types of leaves
simple, compound, double compound, needle
how many different shapes of leaves
ten: linear, oblong, oval, ovate, cordate, lobed, deltoid, orbicular, 4 sided needle, flattened needle
leaf margin
outside of the leaf: smooth, fine-toothed, coarse toothed or serrated, scalloped or wavy
leaf arrangements
how they are arranged on the petiole
What are the 4 types of leaf arrangements?
opposite, alternate, whorl, basal
What are the 5 types of needle arrangements?
bundles of 2, bundles of 5, singly on a twig, scale like, clusters of more than 5
what traits are coniferous
leaves fall continuously, can withstand temperature extremes, waxy coating to prevent water loss, needle leaves, cones
what traits are deciduous
shed leaves in fall, cannot withstand temp. extremes, leave are waxy on top, large surface area underneath, causes water loss, needles or broadleaf, flowers
what traits are both coniferous and deciduous
leaves, nutrient cycle, oxygen cycle, need water
what are ideal conditions for trees to grow and forests to thrive
plenty of water, appropriate amount of sun, lots of decomposers, nutrient rich soil, CO2, lots of space, not a large threat of natural disaster, no harsh winds
Which forest uses are harmful?
human: over harvesting, clear cutting, slash and burn,