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NEET2017BotanyPlant KingdomActual

Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms.

Options

  1. APerianth and no integuments
  2. BEmbryo development and apical meristem
  3. CAbsence of resin duct and leaf venation
  4. DPresence of vessel elements and absence of archegonia

Correct answer

D. Presence of vessel elements and absence of archegonia

Step-by-step solution

Unlike Cycas and Pinus, Gnetum shows the occurrence of vessel elements and the complete absence of archegonia in female gametophyte. Thus, Gnetum shows affinities with angiosperms. Besides its resembles with angiosperms in several other aspects like presence of tetrasporic embryo sac, free nuclear divisions in the embryo sac, two cotyledonous embryo, etc.

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