Wood Flashcards
What functions do trees perform (name 4)
Convert Carbon dioxide to oxygen
Absorb heat and UV light
Filter ground water, trapping & diluting pollution
Root systems help stabilize soil erosion
Provide habitat for plants and living creatures
What does Spermatophyta mean?
Seed bearing plants
Are softwood trees Gymnospermae?
Yes, needle-leaved coniferous, soft wood trees
Are hardwood trees Angiospermae?
yes, broad leafed hardwood trees (both deciduous and evergreen)
What is the function of leaves & needles on a tree?
Leaves produce nutrients though photosynthesis
What does the CITES agreements do?
Convention on International Trade in Endangered Species of Wild Fauna and Flora
To ensure the international trade in specimens of wild animals and plants does not threaten their survival.
The majority of the world’s commercial softwood lumber come from the _________ hemisphere.
Northern
The majority of hardwood lumber comes from the _________ hemisphere
southern
What 3 species of trees make up the majority of Canadian softwood lumber?
Spruce Pine Fir
Douglas Fir
Hem Fir
With respect to the lumber industry, what does the acronym NLGA stand for?
National Lumber Grades Authority
With respect to the lumber industry, what does the acronym CLSAB stand for?
Canadian Lumber Standards Accreditation Board
KD lumber has a moisture content of less than ___%
12-18%
The actual size of a 2x4 is ____inches x _____inches
1 1/2” x 3 1/2”
The actual size of a 2x12 is ____inches x _____inches.
1 1/2” x 11 1/4”
The actual size of a 2x12 is ____inches x _____inches.
1 1/2” x 11 1/4”
Timber is solid wood with its smallest dimension no less than _____inches.
140mm (5 1/2”)
Explain why timber offers a significant protection against fire, compared to lumber.
Because they’re thicker and take longer to burn. Once char is 1” thick it acts as an insulator.
What is the Phloem or Bast layer of a tree?
Inner bark tissue
What is the Cambium layer of a tree
Thin layer of living cell tissue that forms the new wood and bark
What is the pith of a tree
Central core of the tree. Can be weak and suffer from fungal/insect attacks
What is the sapwood layer of a tree
New wood, cells conduct or store nutrients
What is the heartwood layer of a tree?
Mature wood in the spine. Darker than sapwood.
