Selaginella and Salvinia are considered to re | vedclass

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(D) : In the majority of pteridophytes,all spores are of similar kinds; such plants are called homosporous.Genera like $Selaginella$ and $Salvinia$,wh

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embryo develops in female gametophyte which is retained on parent sporophyte.

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(D) : In the majority of pteridophytes,all spores are of similar kinds; such plants are called homosporous.Genera like $Selaginella$ and $Salvinia$,which produce two kinds of spores,macro (large) and micro (small) spores,are known as heterosporous.The megaspores and microspores germinate and give rise to female and male gametophytes,respectively.The female gametophytes in these plants are retained on the parent sporophytes for variable periods.The development of the zygotes into young embryos takes place within the female gametophytes.This event is a precursor to the seed habit,which is considered an important step in evolution.

$Selaginella$ and $Salvinia$ are considered to represent a significant step toward the evolution of seed habit because

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