Wood Flashcards
1
Q
Softwood
A
- A type of tissue found in conifers
2
Q
Hardwood
A
- Only dicotyledon class of flowering plants
3
Q
Angiosperm
A
- Flowering plant
4
Q
Gymnosperm
A
- Conifers
- Cone-bearing seed plants
5
Q
Divisions of trees
A
- Angiosperms
- Gymnosperms
6
Q
Classes of Angiosperms
A
- Dicotyledon (eudicot)
- Monocotyledon
7
Q
What is wood made from?
A
- Accumulation of cell walls of the secondary xylem in conifers and dicot flowering plants
8
Q
What is Xylem and Phloem?
A
- xylem and phloem are vascular tissue
- Xylem conducts water upwards
- Phloem conducts organic constituents
- Can be secondary or primary
9
Q
What is secondary growth?
A
- In diameter of plant (girth)
- Cambium (lateral meristem)
- Produce phloem toward outside of plant, xylem toward inside
- Monocots don’t have secondary growth
10
Q
What is primary growth?
A
- Apical
- Produces leaves, non-woody stems, roots
11
Q
What is the accumulation of xylem tissue?
A
Wood
12
Q
Annual ring of xylem is what?
A
- Formed in one growing season
- Tree rings
- Dendrochronology to get age of tree by annual accumulation of xylem rings
- Springwood cells larger than later season cells
13
Q
Types of xylem cells
A
- tracheid cells, long and thin with tapered ends
- Vessel elements, short wide cells, align to form pipe-like vessels
14
Q
What happens when xylem cells form secondary cell walls?
A
- Cell walls harden with cell death
- Still work in conduction
15
Q
What type of xylem cells do conifers mostly have?
A
- Tracheid
- Makes wood more uniform
16
Q
What type of xylem cells do angiosperms mostly have?
A
- Dicots have more of both types
- Makes more variety wood