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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 $Salvinia$,w

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Origin of seed habit can be traced in pteridophytes.

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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.

Which one of the following is a correct statement?

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