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and are considered to represent a significant step toward evolution of seed habit because:

  1. A
    Megaspores possess endosperm and embryo surrounded by seed coat.
  2. B
    Embryo develops in female gametophyte which is retained on parent sporophyte.
  3. C
    Female gametophyte is free and gets dispersed like seeds.
  4. D
    Female gametophyte lacks archegonia.

Solution & Step-by-step Explanation

Both and are heterosporous. The megaspore is retained on the parent sporophyte, and the embryo develops within the female gametophyte while still attached. This retention is a precursor to the seed habit found in higher plants.

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and are considered to represent a significant step toward evolution of seed habit because:
A
Megaspores possess endosperm and embryo surrounded by seed coat.
B
Embryo develops in female gametophyte which is retained on parent sporophyte.
C
Female gametophyte is free and gets dispersed like seeds.
D
Female gametophyte lacks archegonia.

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Plant KingdomPteridophytes

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