The word leaf comes from the Latin '' folium ''. Leaf is a word that can have several meanings, but its main meaning consists in describing a generally flat organ that is specialized mainly in carrying out photosynthesis, which is responsible for the process of change from inorganic matter to organic matter through the solar energy.
The leaves are laminar or needle-shaped structures that sprout laterally from the stems or branches that have limited growth and have photo-synthesizing tissues because the anatomy of the stems and the leaves are closely related and it is a set of several organs that constitute the stem of the plant.
They can also experience pronounced modifications in the structure, which can be in charge in most cases, such as adaptation to the environment, as a consequence to a different specialization to the typical function of this organ.
There are many types of leaves according to their shape or edge that are like simple leaves, compound, tapered, heart-shaped, ovate, oblong, elliptical, serrated, toothed, auriculate, finger, webbed, whole, scaly or squamiform, spatulate among many others..
The compound leaves are those that are formed by parts called foliose or flakes is similar appearance to the sheet having small appendage or leaf of a plant which joins the stem. The elliptical leaves are those that have an oval shape. The heart-shaped one is the one with a sharp apex and may be widest near the root. And the serrated ones are those that have the edge in the form of a festoon or wave.
On the other hand, each of the parts or sections that are similar and can be found inside a book or notebook is also called a sheet .
