It seem like there are information missing on the question posted. Let me answer this question with all I know. So here is what I believe the answer is, The adult, or sporophyte, phase is the main phase of an angiosperm's life cycle . As with gymnosperms, angiosperms are heterosporous. Therefore, they generate microspores, which will produce pollen grains as the male gametophytes, and megaspores, which will form an ovule that contains female gametophytes.
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