In botany, a tree may be a perennial plant with associate elongated stem, or trunk, supporting branches and leaves in most species. In some usages, the definition of a tree is also narrower, together with solely woody plants with secondary growth, plants that square measure usable as lumber or plants on top of a specified height. top of different plants to contend for daylight. Trees tend to be lasting, some reaching many thousand years recent. In looser definitions, the taller palms, tree ferns, bananas and bamboos are trees. Trees are alive for 370 million years. it's calculable that there square measure simply over three trillion mature trees within the world.[1]
A tree usually has several secondary branches supported afar from the bottom by the trunk. This trunk usually contains woody tissue for strength, and plant tissue to hold materials from one a part of the tree to a different. for many trees it's enclosed by a layer of bark that is a protecting barrier. Below the bottom, the roots branch and detached widely; they serve to anchor the tree and extract wetness and nutrients from the soil. on top of ground, the branches divide into smaller branches and shoots. The shoots usually bear leaves, that capture light-weight energy and convert it into sugars by chemical action, providing the food for the tree's growth and development.