Selaginella and Salvinia are considered to re | vedclass

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(A) The evolution of the seed habit is a critical evolutionary trend in plants. In $Selaginella$ and $Salvinia$,the female gametophyte is not complete

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The development of the embryo takes place within the female gametophyte,which is retained on the parent sporophyte.

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(A) The evolution of the seed habit is a critical evolutionary trend in plants. In $Selaginella$ and $Salvinia$,the female gametophyte is not completely independent; instead,it is retained on the parent sporophyte for a variable period. The development of the zygote into a young embryo takes place within the female gametophyte,which is held on the parent sporophyte. This retention and development of the embryo within the female gametophyte,which is attached to the parent plant,is a precursor to the seed habit found in higher plants (gymnosperms and angiosperms).

$Selaginella$ and $Salvinia$ are considered to represent a significant step towards seed habit because-

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