[" 28.Select one of the following pairs of important "36.],[" features distinguishing Gnetum from Cycas and "],[" pinus and showing affinities with angiosperms :- "],[" (1) Perianth and two integuments "],[" (2) Embryo development and apical meristem "],[" (3) Absence of resin duct and leaf venation "],[" (4) Presence of vessel elements and absence of "],[" archegonia "]