What physical and mechanical properties affect the anisotropic nature of wood? (select all that apply)

The anisotropic behavior of wood is the results of the tubular geometry of the wood cells. Wood cells have what type of cross section? The centers of the tubes are ______, whereas the ends of the tubes are what?

Wood is chemically composed of: (select all that apply)

What wood chemical accounts for 50% of the wood substance by weight, is a linear polymer having a high molecular weight, and has the main building block as sugar-glucose?

As a tree grows, linear cellulose molecules arrange themselves into highly ordered strands. These ordered strands form large structural elements that make up the cell walls of wood fibers. What are these strands called?

By weight, this chemical element in wood accounts for 23% to 33% of softwood, and 16% to 25% of hardwood.

Chemically, lignin is an intractable insoluble material that is loosely bonded to what?

Lignin is the glue that hold what together?

This is made from polymeric units of sugar molecules? It is different in that it has several sugars tied up in its cellular structure.

Extractives make up how much of the wood substance?

Included in this group of chemicals are tannins and other poly-phenolics, coloring matters, essential oils, fats, resins, waxes, gums, starches, and simple metabolic intermediates. What is this group a part of?

Ash-forming materials account for 0.1% to 3.0% of the wood chemical material, and include all of the following: (select all that apply)