| 1. | The megagametophyte is of the " Polygonum " type.
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| 2. | The megagametophytes of endosporic plants such as the angiosperms today.
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| 3. | The pollen tube proceeds to release the two sperm in the megagametophyte.
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| 4. | These would germinate to form microgametophytes and megagametophytes, respectively.
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| 5. | The megaspores become megagametophytes ( embryo sacs ).
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| 6. | This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.
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| 7. | The first seed plants, megagametophyte remains inside the megasporangium, attached to the parent plant.
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| 8. | Inside the ovary / ovaries are one or more ovules where the megagametophyte contains the egg cell.
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| 9. | Then, the megagametophyte is contained within a waterproof integument, which forms the bulk of the seed.
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| 10. | Since the protection of the megagametophyte is evolutionarily desirable, probably many separate groups evolved protective encasements independently.
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