Wood formation is a sequential developmental process, including differentiation of vascular cambium cells into secondary xylem mother cells, cell expansion, massive deposition of secondary walls, programmed cell death, and finally formation of heartwood (Fig. 2).

How wood is formed?

Wood formation is a sequential developmental process, including differentiation of vascular cambium cells into secondary xylem mother cells, cell expansion, massive deposition of secondary walls, programmed cell death, and finally formation of heartwood (Fig. 2).

What are the methods of writing history?

Historical research involves the following steps:

• Identify an idea, topic or research question.
• Conduct a background literature review.
• Refine the research idea and questions.
• Determine that historical methods will be the method used.
• Identify and locate primary and secondary data sources.

Does wood only come from trees?

Wood, in the strict sense, is yielded by trees, which increase in diameter by the formation, between the existing wood and the inner bark, of new woody layers which envelop the entire stem, living branches, and roots.

What is wood made of chemically?

There are two major chemical components in wood: lignin (18– 35%) and carbohydrate (65– 75%). Both are complex, polymeric ma- terials. Minor amounts of extraneous materials, mostly in the form of organic extractives and inorganic minerals (ash), are also present in wood (usually 4– 10%).

What are the different ways of knowing the past?

The following are the ways to find out about the past:

• Historical records: historical records such as inscriptions, travelogue, epics and other official documents etc.
• Monuments: monuments constructed by various rulers provide us with very significant information.

How was the wood used in the past?

Wood is one of the longest standing building materials in existence, with evidence showing homes built over 10,000 years ago used timber as a primary source for construction materials. Wood continues to be used to create both modest buildings such as the log cabin, and impressive structures such as Chinese temples.

How is wood used in everyday life?

Not only has timber been used for building and furniture but it was also critical in the exploration of the world (carts, sleds and wooden ships); it was fundamental in the development of railways (sleepers and bridges); and it is fundamental in the culture of societies (musical instruments for example).

How is wood useful to us?

Answer. Wood to be used for construction work is commonly known as lumber in North America. Elsewhere, lumber usually refers to felled trees, and the word for sawn planks ready for use is timber. In Medieval Europe oak was the wood of choice for all wood construction, including beams, walls, doors, and floors.

What is the chemical formula of cellulose?

(C6H10O5)n