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 :
[b] 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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