From evolutionary poit of view, retention of the femal gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in
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Explanation:
hey mate this is so simple
this is observed in the heterosporous species
especially in
pteridophytes -Sellaginella and Salvia
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ANSWER:
The retention of the 'female gametophyte' with developing 'young embryo' on the 'parent sporophyte' for some time is obsereved in pteridophyte.
EXPLANATION:
The microspores and the megaspores germinate and produce the female gametophytes and the male gametophytes respectively. The 'female gametophytes' present in these kinds of plant are retained on 'parent sporophytes' for variable periods.
The embryo development occurs within the 'female gametophyte'. This is the most important features of the evolution.
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