Selaginella and Salvinia are considered to re | vedclass

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(D) The evolution of the seed habit is a critical evolutionary trend observed in certain pteridophytes like $Selaginella$ and $Salvinia$. These plants

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Embryo develops in female gametophyte which is retained on parent sporophyte

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(D) The evolution of the seed habit is a critical evolutionary trend observed in certain pteridophytes like $Selaginella$ and $Salvinia$. These plants are heterosporous,meaning they produce two types of spores: microspores and megaspores. The key feature representing the seed habit is the retention and germination of the megaspore within the female gametophyte,which remains attached to the parent sporophyte for a variable period. This development of the embryo within the female gametophyte,while it is still attached to the parent plant,provides protection and nutrition to the developing embryo,which is a precursor to the seed habit found in higher plants (gymnosperms and angiosperms).

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

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$A$: $Selaginella$ is heterosporous.
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