Plants belong to the plant kingdom, one of the five kingdoms of living things. Plants are classified into smaller groups, according to shared characteristics. All plants share certain features. They are made up of many cells. they also their own food by a chemical process called photosynthesis, using water carbon dioxide and the energy of sunlight. As a by-product they release life - giving oxygen into the air.
Within the plant kingdom, plants are divided into two main groups. the largest group contains the plants that produce seeds. These are flowering plants (angiosperms) and conifers, ginkos and cycads(gymnosperms). the other group contains the seedless plants that reproduce by spores. It includes mosses, liverworts, horsetails, and ferns. So far scientists have named 400,000 separate plant species. Around 300,000 of these are flowering plants