The plant body consists if many different types of cell, each enclosed in its own cell wall and united with other cells by means of a cementing intercellular substance. Each cell is a community of subcellular components. These cell are surrounded by cell walls that provide an elastic support for retaining the contents of the cell.
The cell also has a membrane layer, which is located just inside the cell wall and which controls the passage of liquids into and out of the cell. The membrane functions as the boundary of the cell, to contain the cellular components.
The cell is filled with jelly-like substance, termed the cytoplasm, which is composed of protein, sugars, salts and other substance dispersed in water. The protoplasm contains organelles, which carry on some vital metabolic functions and erg antic substances, which do not function in metabolisms and have a variety of functions such as storage, waste secretion and protection.
Mature cells also contain vacuoles, which are separate compartments filled with a fluid, cell-sap and which are composed of dissolved sugars, salts, organic acids, pigments and other materials.
The nucleus is the largest cell organelle and it is therefore hardly surprising to find that is structure is complex and that is performs many different functions. Also located within the cytoplasm are separate inclusion bodies , called plastids, which contains the pigment of chlorophyll. These plastids are only both 4 to 10 nm in diameter.
Cell structure of plant tissue
