The heterosporous pteridophytes show certain

Question:

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

Solution:

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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