From an evolutionary point of view, retention of the female gametophyte with developing young embryo on the pa

Question

From an evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in:

Accepted Answer

in heterosporous pteridophytes, the female gametophytes are retained on the parent sporophytes for variable periods. The development of the zygotes into young embryos takes place within the female gametophytes. This event is considered a precursor to the seed habit and is an important step in evolution .

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