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Selaginella and Salvinia are considered to represent a significant step towards evolution of seed habit because :
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- female gametophyte is free and gets dispersed like seeds
- female gametophyte lacks archaegonia
- megaspores possess endosperm and embryo surrounded by seed coat
- embryo develops in female gametophyte which is retained on parent sporophyte.
Correct Option: D
Selaginella and Salvinia are advanced pteridophytes.
