AIIMS 201827 May
- Exam
- AIIMS
- Year
- 2018
- Date
- 27 May
- Subject
- Botany
- Chapter
- Plant Kingdom
AIIMS 2018 · 27 May · Botany · Plant Kingdom
Select one of the following pairs of important features...
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms.
Options
- APerianth and two integuments.
- BEmbryo development and apical meristem.
- CAbsence of resin duct and leaf venation.
- 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 absence of archegonia. Thus, Gnetum shows affinities with angiosperms. Besides,it resembles angiosperms in several other aspects like presence of tetrasporic embryo sac, free nuclear divisions in the embryo sac, two cotyledonous embryo, etc.