Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because
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a
Female gametophyte is free and gets dispersed like seeds
b
Female gametophyte lacks archegonia
c
Megaspores possess endosperm and embryo surrounded by seed coat
d
Embryo develops in female gametophyte which is retained on parent sporophyte
answer is D.
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Detailed Solution
Salvinia and Selaginella are heterosporous pteridophytes. The development of zygote into young embryo take place within the female gametophytes. This event is a precursor to the seed habit considered an important step in evolution.