How is plantae distinguished from other eukaryotic kingdoms?
Plant cells are quite different from the cells of the other eukaryotic organisms. Their distinctive features are: * A large central vacuole (enclosed by a membrane, the tonoplast), which maintains the cell’s turgor and controls movement of molecules between the cytosol and sap * A primary cell wall containing cellulose, hemicellulose and pectin, deposited by the protoplast on the outside of the cell membrane; this contrasts with the cell walls of fungi, which contain chitin, and the cell envelopes of prokaryotes, in which peptidoglycans are the main structural molecules * The plasmodesmata, linking pores in the cell wall that allow each plant cell to communicate with other adjacent cells; this is different from the functionally analogous system of gap junctions between animal cells. * Plastids, especially chloroplasts that contain chlorophyll, the pigment that gives plants their green color and allows them to perform photosynthesis * Higher plants, including conifers and flowering plan
