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Year 7 Wood Work

Year 7 Wood Work. Timber and Trees. Different types of construction projects call for different kinds of timber , and many people are familiar with the concepts of hardwood and softwood.

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Year 7 Wood Work

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  1. Year 7 Wood Work Timber and Trees

  2. Different types of construction projects call for different kinds of timber, and many people are familiar with the concepts of hardwood and softwood. However, few people know why woods are split into these two categories, and make the assumption that hardwoods are hard, while softwood is soft. This distinction is incorrect: balsa wood, for example, is classified as a hardwood despite the fact that it is very soft and light. Softwood and hardwood are actually distinguished botanically, not by their end use or appearance.

  3. Softwoods! Softwood comes from a type of tree known as a gymnosperm. Gymnosperms reproduce by forming cones which emit pollen to be spread by the wind to other trees. Pollinated trees form NAKED SEEDS, which are dropped to the ground or borne along the wind so that new trees can grow elsewhere. Some examples of softwood include pine, redwood, fir, cedar, and larch.

  4. Soft wood Structure Soft woods are made up of cells called Tracheids which are tube like structures in shapes very similar to rectangles. These tracheids transport nutrients and water throughout the tree to keep it alive Pine cones and American Acorns are just two types of seeds produced by soft wood trees. Pine cones drop to the ground where the seeds can then be blown away or replant where they fall.

  5. HARD WOODS! A hardwood is an Angiosperm, which means that it makes enclosed seeds or fruits. Angiosperms usually form flowers to reproduce. Birds and insects attracted to the flowers carry the pollen to other trees, and when fertilized the trees form fruits such as apples or nuts and seeds like acorns and walnuts. Hardwoods include maple, balsa, oak, elm, mahogany, and sycamore.

  6. Hard Wood Structure Hardwoods have two types Of cells - called Pores. One is for strength in the tree The other is for water transport And storage. Balsa wood is a very soft timber but has the same structure of hardwood making the old saying of “a hardwood is hard and a softwood is soft” Hardwoods also have broad flat leaves and irregular branches such as on Australian Eucalypt

  7. PARTS OF A TREE Trees are made up of several different key parts

  8. Growing Trees • A tree establishes itself in the ground from a seed • It then produces a root system, a stem (or trunk) and branches with leaves • Over time, with water and nutrition from the soil, a tree will grow to maturity. Trees produces seeds for the next generation of trees. • It takes many trees a long time to mature, so this process can take a long time….some trees such as the giant redwoods of North America, are hundreds of years old

  9. HOW OLD?? • Prometheus a Great Basin Bristlecone Pine that was cut down in Nevada USA, in 1964 is believed to be the one of the oldest trees ever found coming in at a ripe old age of 5,000 yrs old….. • A tree (mainly its root and stem system) have been dated to be 9,550 yrs old, its stem system lasts around 600 years but it produces new stems (trunks) from the same root system….cloning itself to form what is believed to be the oldest living tree on earth.

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