Write affinities of gymnosperms with pteridophytes and angiosperms.
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“Ferns with seeds” (Pieridosperms)
was the common name given to the primitive gymnosperms like Cycadofilicales due to their resemblances with the ferns.
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Resemblances of Gymnosperms with Pteridophytes:
1. Plant body is sporophytic, and the sporophyte is differentiated into roots, stem and leaves in both gymnosperms and pteridophytes.
2. Members of both the groups show a regular alternation of sporophytic and gametophytic generations.
3. Cercinate vernation of the young leaves is seen in both the groups.
4. Xylem consists of tracheids and xylem parenchyma. Vessels are absent in pteridophytes as well as gymnosperms (except Gnetales).
5. Phloem lacks companion cells in both the groups.
6. Heterospory is common in both gymnosperms and pteridophytes.
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