mention the characters of gymnosperm resembling pteridophyta
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Answer:
The gymnosperms and pteridophytes resemble each other as follows:
1. Both have independent sporophytes that are distinguished into root, stem and leaves
2. The sporophytes possess a well developed vascular system.
3. The xylem in most of the members of both groups lacks vessels and the phloem lacks companion cells.
4. Many cycads resemble the ferns in having large compound leaves and in the circinate ptyxis of the leaves.
5. The alternation of generations is heterologous.
6. The female sex organs are archegonia both in pteridophytes and gymnosperms.
7. The male gametes of Cycads and Ginkgo are motile as in pteridophytes (ferns).
8. Many pteridophytes such as Marsilea, Salvinia, Azolla, isoetes, and Selaginella are heterosporous like gymnosperms.
9. Some of the heterosporous pteridophytes possess one megaspore in the mega-sporangium like gymnosperms.
10. The gametophytes of gymnosperms and heterosporous pteridophytes are endosporic.
11. The gametophytes are highly reduced. The male gametophytes of heterosporous pteridophytes and most of gymnosperms possess only two male prothallial cells.
Explanation:
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