All plants are multicellular eukaryotes and photosynthetic autotrophs. They have cell walls made primarily of cellulose, and they store excess food in the form of starch, in plastids such as chloroplasts.
Plants generally reproduce sexually, and most also can reproduce asexually.
The length of time and importance of each of these stages differs between plants, as in ferns, for example, where the sporophyte is the dominant generation, compared with mosses in which the gametophyte is the more obvious generation. All green parts of a plant have cholorplasts. These appear green because they contain pigments that reflect and transmit green light. The chloroplasts absorb primarily red and blue light. Plants evolved probably from an algal ancestor that lived in water from which green algae probably also evolved.