The kingdom Plantae includes all land plants, mosses, flowering plants, ferns and so on. With an excess of 250,000 plant species, the kingdom Plantae is the second largest family of organisms. Only the Arthropoda family is larger.
The most striking characteristic associated with plants is their green color. The greenness associated with plants is a result of chlorophyll, a pigment necessary for capturing light energy, which is vital to manufacturing carbohydrates, starch, sugar and other nutrients. Without the ability to break down these nutrients and soak in sunlight, the majority of life on earth would cease to exist. Moreover, plants provide the essential oxygen humans need to breathe, cures for a number of ailments and food to help sustain human life.
Another crucial contribution of the plant kingdom is its ability to shape the environment. The only ecosystems or environments without plant life are barren wastelands or brutally frigid climates. Earth is otherwise populated by significant amounts of plant life.
The kingdom Plantae is organized by four classification systems: seed structure, tissue structure, reproductive characteristics and stature.
There are three distinct characteristics that separate plant life from animal life. Plants are fixed in one place (they do not move), consist of cell walls comprised of cellulose and, as stated before, possess chlorophyll, the pigment necessary for photosynthesis.