The multicellular body of a higher flowering plant (angiosperm) develops from a single cell (zygote), which is formed by the union of male and female sex cells. The zygote gives rise to the embryo which ultimately develops into a well differentiated plant. As indicated in the first chapter the multicellular body of organisms is organised into definite tissues, organs and organ systems. Tissues are assemblages of structurally and functionally similar cells and many types of tissues are organized into a composite body called an organ for a specific function. Many organs, when they are connected structurally and are interconnected and co-ordinated in their function, constitute organ systems. The formation of tissues in a higher plant begins in growing regions called meristems (Greek merizein, to divide) where active mitosis takes place. The resulting cells at first form temporary tissues, which may then become modified into the characteristic permanent tissues of the plant.
Structure of a Flowering Plant
A typical flowering plant (angiosperm) consists of a portion above the ground, the shoot and a portion below the ground, the root, although it is not necessary that any part of the plant below the ground be a root only. The shoot is usually made up of a system bearing the stem, leaves, buds and flowers (Fig. below).
In picture, the part named later at root should be changed as lateral root.
Fig: A Flowering Plant