Heterosporous pteridophytes always produce

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(B) Heterosporous pteridophytes (e.g.,$Isoetes$,$Selaginella$,$Marsilea$,etc.) produce two types of spores: microspores and megaspores.Microspores ger

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Dioecious gametophytes

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(B) Heterosporous pteridophytes (e.g.,$Isoetes$,$Selaginella$,$Marsilea$,etc.) produce two types of spores: microspores and megaspores.Microspores germinate to form male gametophytes,and megaspores germinate to form female gametophytes.Since the male and female gametophytes are separate,they are referred to as dioecious gametophytes.The development of the gametophyte is endosporic,meaning it occurs within the spore wall.

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