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Select one of the following pairs of imp...

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

A

Perianth and two integuments.

B

Embryo development and apical meristem.

C

Absence of resin suet and leaf venation.

D

Presence of vessed clements and absence of archegonia.

Text Solution

Verified by Experts

The correct Answer is:
D
Unlike Cycas and Pinus, Gnetum shows the occurrence of vessel elements and the absence of archegonia. Archegonia are altogether absent in the female gametophyte and vessels occur in the xylent along with the tracheids in the secondary wood. Thus Gnetum shows affinities with angiosperms. Besides it resembles angiospernis 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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