Following characters of seed plants made them specially adapted to life on land are :
(a) Presence of extensive root system for anchorage and absorption, development of mechanical tissues for support and vascular tissue for long distance transport of sap and food.
(b) Development of pollination, or transfer of microspores to the megasporophylls.
(c) Replacement fo external supply of water for fertilization by the development of pollen tube for carrying sperms to female gamete.
(d) Transformation of megasporangium and production of embryo in the ovule.