Classification of the tree: 
    For engineering purposes, the trees are classified according to their mode of growth. 
    Endogenous tree: 
    •    These trees grow inwards. 
    •    Timber from these trees has very limited engineering applications. 
    •     Examples of endogenous trees are bamboo, cane, palm, etc. 
    Exogenous tree: 
    •    These trees grow outwards, increasing in bulk with the formation of the ring every year. 
    •    These annual rings are used for predicting the age of the tree. 
    •    These trees are mostly used for engineering work. 
    •    They are further divided into conifers and deciduous.