A) absence of resin duct and leaf venation
B) presence of vessel elements and absence of archegonia
C) perianth and two integuments
D) embryo development and apical meristem
Correct Answer: B
Solution :
Gnetum resembles angiosperms in many aspects:- (i) The leaves in Gnetum have reticulate - venation that is an angiospermic character. (ii) The presence of vessels in the xylem is also an angiospermic character and also found in Gnetum. (iii) In Gnetum female gametophyte is only partly cellular before fertilization and becomes completely cellular only after fertilization. Some of the free nuclei act as eggs as there is no archegonium. The short apices in Gnetum and angiosperms show a distinct tunica and corpus configuration. The cortex of stem of Pinus is traversed by large resin ducts or canals. Each duct or canal is lined by a layer of thin-walled parenchymatous glandular secretory cells constituting epithelium. The epithelial cells secrete resin into canal. Resin is the chief source of turpentine.
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