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Answer» certain ferns certain pines certain monocots primitive dicots Solution :(a) The tendency towards seed FORMATION is called seed HABIT. It was DEVELOPED in fossil gymnosperm of group Cycadofilicales (pteridosperms), i.e.Seed ferns, e.g.Lyginopteris which bears characters of cycads and ferns both, Seed habit is SHOWN by few pteridophytes like Selaginella, Marselia, Isoetes, etc. which exhibit HETEROSPORY.
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