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.
The skin has two parts: the epidermis and the hypodermis. A waxy layer of cells known as the cuticle covers the skin s epidermis. The wax in the cuticle helps the stem to hold in its water vapor reducing water loss.On some cacti, the waxy cuticle is also lightly colored and reflects some of the incident light.rystals in the hypodermis of some plants deter small animals from foraging on the plant. Areoles: New growth, spines, flowers, and glochids originate from pad-like structures on the cactus stem named areoles.