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What gives wood its stiffness and strength?

non-woven fabric

cellulose

wadding

lignin

Lignins are particularly important in the formation of cell walls, especially in wood and bark, because they lend rigidity and do not rot easily. Chemically, lignins are cross-linked phenolic polymers. Lignin constitutes 30% of non-fossil organic carbon and 20 to 35% of the dry mass of wood.

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4

RichardBH wikipedia → Lignin

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Answers by country

Estonia

0%

10%

0%

90%

10

Australia

0%

30%

0%

65%

20

Republic of Ireland

0%

29%

5%

64%

17

Greece

7%

30%

7%

53%

13

Switzerland

0%

38%

11%

50%

36

India

6%

33%

11%

47%

103

Pakistan

9%

42%

0%

47%

21

the Netherlands

22%

33%

0%

44%

18

Canada

17%

21%

17%

43%

23

Austria

3%

46%

11%

38%

118

Italy

15%

30%

7%

38%

13

Germany

5%

45%

10%

36%

388

France

28%

28%

7%

35%

14

Poland

15%

44%

5%

33%

3227

the United States

3%

51%

10%

33%

106

the United Kingdom

14%

48%

10%

24%

82

How deep is the root system of a giant sequoia?

4 meters (13 feet)

20 meters (60 feet)

40 meters (130 feet)

80 meters (260 feet)

Which non-coniferous trees are the tallest in the world?

This kind of tilted forest is a common sight in subarctic taiga. What is this phenomenon caused by?

low sun position

Where were parking meters first popularized?

in United States