Selelct one of the following paris of important features distinguishig Gnetum from Cycas and Pinus and showing affinities with angiosperms

Options

A. Perianth and two integuments.
B. Embryo development and apical meristem.
C. Absence of resin suet and leaf venation.
D. Presence of vessed clements and absence of archegonia.

Answer

D

Explanation

Unlike Cycas and Pinus, Gnetum shows the occurrence of vessel elements and the absence of archegonia. Archegonia are altogether absent in the female gametophyte and vessels occur in the xylent along with the tracheids in the secondary wood. Thus Gnetum shows affinities with angiosperms. Besides it resembles angiospernis in several other aspects like presence of tetrasporic embryo sac, free nuclear divisions in the embryo sac, two cotyledonous embryo etc