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Academic Questions in Basic Technology
Which of the following is not a function of thin continuous line in Technical drawing?
The following are Types of Line in Technical Drawing EXCEPT _____.
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Wood are derived from the stem, trunks and branches of trees.
A wood is an organic material and a structural tissue composed mainly of cellulose; and it constitutes the stem, roots and branches of trees.
The outermost skin or covering of the wood is called the bark. On peeling off the bark, next to be seen is the sapwood which contains the plant's transport system called the xylem. Also seen inside the sapwood is the heartwood, but here, the xylem is blocked with gums; making it functionally inactive. The cambium is seen around the edge of the sapwood.
We have two types of wood. They are
Note: Woods are porous and fibrous and the terms 'hardwood and softwood' don't always refer to the wood's actual hardness or softness.
Hardwoods are derived from angiosperms.
Angiosperms are flowering plants that produce seeds encased in fruits or pods.
Most times, hardwood are stronger than softwood but there are exceptions. For instance, balsa is a hardwood that is actually soft.
Examples of hardwood include iroko, ash, beech, alder, teak, birch, mahogany, maple, oak, balsa and walnut.
Softwoods are often derived from coniferous trees; that is, trees with needle-like leaves and whose seeds are covered in cones.
Note: Coniferous trees are classified under gymnosperms.
Examples of softwood include cedar, larch, juniper, yew, cypress, fir, pine, spruce, douglas fir and redwood.
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