The heterosporous pteridophytes show certain


The heterosporous pteridophytes show certain characteristics, which are the precursor to the seed habit in gymnosperms. Explain.


Genera like selaginella, Sylvania, Marsilea etc produces two kinds of spores. Micro and macrospores which are known as heterosporous.

(i) Evolutionary heterospory

(ii) In-situ development of the embryo within the female gametophyte.

(iii) The decrease in the number of megaspore to one.

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