Tree is a perennial woody plant. The tree is grouped as follows: a woody plant with a single main stem or trunk with a distinct apex protruding from the ground, which develops into a multifaceted minor branch. [1] [3] Some writers have set a minimum diameter of 10 cm for tree trunks. [4]; Other woody trees that do not meet these conditions, such as branched main stems or small-sized trees are called shrubs. Compared to other plants, trees are long-lived, some live up to a thousand years and can grow up to 115 meters. [5]
Trees are an important element of natural beauty because they prevent soil erosion and create weather-protected ecosystems under their foliage. Trees also play an important role in generating oxygen and removing carbon dioxide from the air and controlling ground temperature. These are the elements of landscaping and agriculture, due to their aesthetic appeal and variety of fruits. Wood obtained from trees is used in making various structures including houses and as fuel wood. As of 2005, there were about 4 billion trees in the world, about 61 per person. [6]