For other uses, see API (disambiguation). In computer programming, an Application Programming Interface (API) is a set of subroutine definitions, protocols, and tools for building application software. In general terms, it is a set of clearly defined methods of communication between various software components.
7. epidermis. The epidermis cells (from the Greek ÎµÏÎ¯Î´ÎµÏÎ¼Î¯Î´Î±, meaning over-skin) is a single-layer of cells that covers the leaves, flowers, roots and stems of plants.It forms a boundary between the plant and the external environment.tomata are holes in the plant epidermis that are surrounded by two guard cells, which control the opening and closing of the aperture. These guard cells are in turn surrounded by subsidiary cells which provide a supporting role for the guard cells. Stomata begin as stomatal meristemoids.
There are even differences in the epidermis on the underside and upper side of a leaf. Usually, the outer walls of the epidermal cells are thickened for protection, and they may be covered with a waxy, waterproof coating called a cuticle. The cuticle prevents the plant from losing too much moisture, which is why you tend to see waxy plants in desert environments. The leaves of the desert creosote bush are covered with a waxy cuticle. In reality, The epidermal layer of a leaf does not completely seal the surface.