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Biology · PLANT KINGDOM

हिन्दी

The evolutionary event considered a critical precursor to the 'seed habit' in higher plants is observed in heterosporous pteridophytes. This event involves:

  1. Complete degradation of the sporophyte generation to depend on independent gametophytes.
  2. Retention of the female gametophyte on the parent sporophyte and embryo development within it.
  3. Dispersal of megaspores prior to fertilization without archegonia formation.
  4. Formation of non-motile male gametes inside airborne pollen tubes.

Correct answer · Option 2

Retention of the female gametophyte on the parent sporophyte and embryo development within it.

Explanation

In heterosporous pteridophytes (e.g., Selaginella, Salvinia), female gametophytes are retained on parent sporophytes for variable periods, and zygotes develop into young embryos inside female gametophytes, marking a precursor to seed habit.
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