Plant KingdomHard
Question
Select one of the following pairs of important features distinguishing Gnetum from cycas and pinus and showing affinities with angiosperms
Options
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
Solution
Gnetum resembles angiosperms in many aspects.
(i) The lenaves in Gnetum have reticulate venation that is an angiosperms character.
(ii) The presence of vessels in the xylem is also an angiospermic character and also fund in Gnetum.
(iii) In Gnetum female gametophyte is only partly cellular before fertilization and be comes completely cellular only after fertilization. Some of the free nuclei act as eggs as there are no archegonia.
The short apices in Gnetum and angiosperms show a disitnct tunica and corpus configuration.
(i) The lenaves in Gnetum have reticulate venation that is an angiosperms character.
(ii) The presence of vessels in the xylem is also an angiospermic character and also fund in Gnetum.
(iii) In Gnetum female gametophyte is only partly cellular before fertilization and be comes completely cellular only after fertilization. Some of the free nuclei act as eggs as there are no archegonia.
The short apices in Gnetum and angiosperms show a disitnct tunica and corpus configuration.
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