InterviewSolution
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InterviewSolution
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Which of the following characters represents the affinities of Gnetum with angiosperms and differences with Cycas and Pinus?A. presence of xylem vessel and absence of achegoniaB. peranth and two integumentsC. embryo development and apical meristemD. Absence of resin ducts and leaf venation |
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Answer» Correct Answer - A Gnetum belongs to gymnosperms yet shows similarities with angiosperms on one hand and shows differences with other groups as cycads and conifers at the same time. Resemblance withh the angiosperms. (i). In general habit, it is climber as tree- like (ii). Leaves are broad, green and with reticulate venation. (iii). Archegonia are altogetehr absent in the female gametopyte. (iv). Absence of free nuclear division in the embryo sac. (v). Endosperm completes its development after the fertilisation. (vi). Exylem vessels are present these similarties with angiosperms, separates it from toher groups of gymnosperms, e.g. cycas and pinus. |
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