What are the two main classes of wood? What is the main use of each class? State the names of two tree species of each class.
The main classes of wood, use of each class, and the tree species of each class.
Explanation of Solution
Class of wood:
Wood is one of the best civil engineering material. Availability of this material is easy, and it is very economical in cost. At the same time, it is durable and easy to use. Based on the type of growth, it can be divided into two types. They are as follows:
- Endogenous type-It grows inward in longitudinal fibrous mass. In United States, the woods from endogenous type are not utilized for construction.
- Exogenous type-It grows outward across the horizontal section.
Uses:
- Exogenous tresses are only fit for engineering construction.
- The stem of endogenous tress is light; therefore, it has very limited engineering application. It can be utilized for ornamental works.
Trees species of each class:
- Bamboo, hemp, and cane come under endogenous type.
- Oak, pine, fir, and maple are the species of exogenous type.
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