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Selaginella and Salvinia are considered to represent a significant step towards evolution of seed habit because:

1. female gametophyte is free and gets dispersed like seeds
2. female gametophyte lacks archegonia
3. megaspores possess endosperm and embryo surrounded by seed coat
4. embryo develops in female gametophyte which is retained on parent sporophyte

Correct answer: embryo develops in female gametophyte which is retained on parent sporophyte

Solution

Selaginella and Salvinia show a key pre-seed condition: the female gametophyte remains within the megaspore and is retained on the sporophyte while the embryo develops. This retention is an important evolutionary step toward the seed habit, even though true seed structures are absent.

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