Lec 18 - Wood and Wood Products Flashcards Preview

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Flashcards in Lec 18 - Wood and Wood Products Deck (35)
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1
Q

wood once used in

A

golf clubs and hockey sticks

2
Q

tree:

A

erect, single stemmed woody plant that can exceed 6m in height

3
Q

tallest tree + info:

A

Coast redwood in californa (115.7m)

4
Q

tree can stand due to

A

secondary trees

5
Q

for a tree to grow in girth, it must be capable of producing

A

“secondary growth”

6
Q

are bamboo and banana trees? why?

A

no. because no secondary growth occurs in monocotyledonous plants

7
Q

the ____________ is required for secondary growth

A

lateral meristem vascular

8
Q

vascular bundles present:

A
  • fasicular cambium and interfasicular cambium fuses

- vascular cambium grow and form to inside and outside

9
Q

wood:

A

a combo of xylem vessels, tracheids,divers and parenchyma

10
Q

how do rings occur in wood

A
  • since wood produced is older than spring wood vs summer wood
  • due to less water, less cell growth, means smaller rings
  • ## new cylinders of secondary zylem a year produced
11
Q

heartwood cant transfer water due to

A

resin which prevents decay

12
Q

dendrochronology

A

the study of tree rings

- rings with living trees are matched with fallen trees to produce a record

13
Q

who does dendrochronology work?

A

a tool is punched into the tree, a cork is retrieved so the rings can be counted

14
Q

dendroclimatology used to determine

A
  • if droughts occurred in cyclic patterns

- indicates impact of pollution, pests, forest fires, volcanoes, and earthquakes

15
Q

wood hardness

A

relates to sturdiness of cell wall

16
Q

sturdiness of cell wall due to

A

cellulose and lignin content

17
Q

hardest wood

A

lignun vitae (density 1.37g/cm^3)

18
Q

what wood has the ability to float

A

balsa wood

19
Q

hardwood consists of

A

a combo of xylem vessels and tracheids

20
Q

hardwood is from what plants

A

angiosperm trees

21
Q

softwood is from what plants

A

gymnosperms

22
Q

softwood consists of

A

solely tracheids

23
Q

wood characteristics of appearance

A
  • # of rays
  • porosity (in hardwoods)
  • arrangement of annual rings
  • presence or absence of knots
  • grain
24
Q

how can termites digest wood?

A
  • protist symbiotic relationship between termite and protist bacteria break down wood in pieces
  • enzymes break down proteins in wood
25
Q

what lead to the decline of white pine (timber tree) in North America

A

a fungul disease

26
Q

what wood does not warp

A

white pine

27
Q

what wood is used in plywood production

A

Douglas fir

28
Q

what woods are used for furniture

A

white oak and ideally black walnuts

29
Q

what wood is 1% (150,000 trees) of all wood utilized in ikea furniture

A

black walnut

30
Q

nearly 1/2 of wood produced in industrialized nations used for

A

pulp

31
Q

wood pulp

A

a watery suspension of pulverized wood

32
Q

____________________ of wood is critical for pulp production

A

de-lignification

33
Q

lignin can be turned into

A

vanilin (a vanilla substitute)

34
Q

what is environmentally costly in pulp production

A

lignin removal

35
Q

charcoal

A

pure carbon and can yield a flame at a high temp