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The density of wood varies with

Origin
Species
Grass family
Cellulose


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One by-product of wood burning is ?

Wood ash
Fire
Air
Alkaline


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The heavy removal of wood from forests can cause ?

Oxidation
Precipitation
Soil erosion
Saline soil


Erosion is the process by which soil and rock are removed from the Earth''s surface by exogenetic processes such as wind or water flow, and then transported and deposited in other locations. While erosion is a natural process, human activities have increased by 10-40 times the rate at which erosion is occurring globally.

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The first wood gasifier was apparently built by Bischof in ?

1839
1840
1842
1838


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In Italy, the most important species for tree plantations is ?

Stone pine
Populus
Fraxinus
Oak


Populus is a genus of 25–35 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere. English names variously applied to different species include poplar, aspen, and cottonwood.

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Wood that has been washed onto a shore or beach of a sea, lake, or river by the action of winds, tides or waves is called ?

Driftwood
Lumber
Pulpwood
Plywood


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Which type of xylem is the wood sometmes defined in the stems of trees ?

Primary
Secondry
Tersiory
None of above


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The reddish-brown streaks so common in hickory and certain other woods are mostly the result of ?

Injury by birds
Pesticides
Heavy winds
Global warming


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Most woody plants form new layers of woody tissue

Each year
Each month
Every week
Daily


Most woody plants form new layers of woody tissue each year, and so increase their stem diameter from year to year, with new wood deposited on the inner side of a vascular cambium layer located immediately beneath the bark.

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Symbiotic bacteria in _______ may play a role in the degradation of sunken wood

Aromatic rings
Xylophaga
Lignin
Hemicellulose


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