CH. 3 WOOD

Question 1

Bark

Answer 1

Outer most protective layer of a tree.

Question 2

Cambium

Answer 2

Source of new cells

Question 3

Sapwood

Answer 3

Living cells that store and transport nutrients

Question 4

Heartwood

Answer 4

Dead cells that contribute to structural strength

Question 5

Pith

Answer 5

Inner most layer - first years growth

Question 6

Annual growth rings

Answer 6

Result from differences in rate of tree growth and density of cells from spring to summer

Question 7

Cellulose

Answer 7

Tubular cells that make up wood

Question 8

Lignin

Answer 8

Cementing substance that holds cellulose together

Question 9

Grain

Answer 9

Direction of long axes as of cells

Question 10

Springwood

Answer 10

Also referred to as earlywood. Cells are larger and less dense making it weaker

Question 11

Summerwood

Answer 11

Also referred to as Latewood. Cells are smaller and more dense making it stronger

Question 12

Softwood

Answer 12

Comes from coniferous trees. Has a simple cell structure. Mostly found in North American forests. Fast growing. Inexpensive. Soft and easily worked. Used for structural wood products such as finish trim shingles, siding, flooring

Question 13

Hardwood

Answer 13

Comes from broadleaf/deciduous trees. Has a complex cell structure. Harvested around the world. Slower growing. Denser with a greater variety of colors and figure. Used for fine trim, paneling, flooring, find cabinet work, and furniture

Question 14

Tracheid

Answer 14

Large longitudinal cells

Question 15

Ray

Answer 15

Radial cell

Question 16

Fiber

Answer 16

Small diameter

Question 17

Vessel/pore

Answer 17

Large diameter

Question 18

Grain figure

Answer 18

Grain structure