| 1. | Individual plants are either male producing microspores or female producing megaspores.
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| 2. | These plants have two spore types, megaspores and microspores.
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| 3. | The megaspore then undergoes megagametogenesis to give rise to the female gametophyte.
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| 4. | Megaspores are gray or black, 350-480 ?m in diameter.
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| 5. | A megasporocyte inside a megasporangium or ovule undergoes meiosis, producing four megaspores.
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| 6. | Only one is a functional megaspore whereas the others stay dysfunctional or degenerate.
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| 7. | The megaspores become megagametophytes ( embryo sacs ).
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| 8. | This type of megagametophyte develops from the megaspore through three rounds of mitotic divisions.
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| 9. | The best way to identify them is by examining the megaspores under a microscope.
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| 10. | The megaspore that remains divides nuclei that later merge to make a diploid nucleus.
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