Solution :(d) Gymnosperms (Gk Gymno=naked , sperma-seed) are commonlyknown as naked seed PLANTS because their ovules (which later become seeds) are not coveredand lie naked on the surfaces of specialised leaves called megasporophylls or ovuliferous scales, ARRANGED into CONES, FLOWERS are absent, seed may have two, (e.g.Cycas) or more (e.g. Pinus) cotyledons.