These trees grow in large numbers by growing outwards and separate continuous rings are formed in the horizontal part of such trees. These rings are known as annual rings, because one such ring is added each year. Such trees are also large in diameter. Wood, which is mostly used for engineering purposes, belongs to this category.
The exogenous trees are further classified as
- Conifers
- DeciduousConifers: The conifers are known as evergreen trees. These trees bear cone-shaped fruits. These trees yield soft woods, which are generally light in colour, resinous, light in weight and weak.Deciduous: They are also known as broad leaf trees. The leaves of these trees fall in autumn and new ones appear in spring. Timber for engineering work is mostly derived from deciduous trees.
Trees can also be classified based on hardness into the following categories.
- Hard wood
- Soft wood
The soft wood forms a group of evergreen trees while the hard wood forms a group of broad leaf trees. Examples of soft woods are deodar, pine and other conifers. Hard woods include sal, mahogany, teak, oak, etc.
Leave a Reply