Plants Used By People

Plants are living organisms belonging to the kingdom Plantae. They include familiar organisms such as trees, flowers, herbs, bushes, grasses, vines, ferns, mosses, and green algae. The scientific study of plants is known as botany. As of 2010, botanists have identified more than 315,000 species of plants, of which 281,821 are flowering, 12,000 are ferns and fern allies, and 16,236 are bryophytes. Green plants, sometimes called Viridiplantae, obtain most of their energy from sunlight via photosynthesis. This process uses chlorophyll contained in chloroplasts, which gives plants their green color.
Definition
Aristotle divided all living things between plants (which generally do not move), and animals (which often are mobile to catch their food). In Linnaeus' system, these became the Kingdoms Vegetabilia (later Metaphyta or Plantae) and Animalia (also called Metazoa). Since then, it has become clear that the Plantae as originally defined included several unrelated groups, and the fungi and several groups of algae were removed to new kingdoms. However, these are still often considered plants in many contexts, both technical and popular.