Which of the following characters represents the affinities of Gnetum with angiosperms and differences with Cycas and Pinus?

Options

A. Presence of xylem vessel and absence of archegonia
B. Perianth and two integuments
C. Embryo development and apical meristem
D. Absence of resin ducts and leaf venation

Answer

A

Explanation

Gnetum belongs to gymnosperms yet shows similarities with angiosperms on one hand and shows differences with other groups as cycads and conifers at the same time.
Resemblance with the angiosperms.
(i). In general habit, it is climber as tree- like
(ii). Leaves are broad, green and with reticulate venation.
(iii). Archegonia are altogether absent in the female gametophyte.
(iv). Absence of free nuclear division in the embryo sac.
(v). Endosperm completes its development after the fertilisation.
(vi). Xylem vessels are present
these similarities with angiosperms, separates it from other groups of gymnosperms, e.g. cycas and pinus.