Answer:
Heterospory is the phenomenon of formation of two types of spores, i.e., smaller microspore and larger megaspore. This phenomenon was firstly reported in Selaginella, a pteridophyte.
The phenomenon of heterospory lead to the reduction of gametophyte, in situ germination of spores, retention of megagametophyte in the megasporangia and finally to the seed development. Examples of heterospory are Selaginella, Salvinia and Marsilea, etc.
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