| 1. | This entire structure with its eight nuclei is called the embryo sac.
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| 2. | The embryo sac is of the " Fritillaria " type.
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| 3. | Two polar nuclei are left in the central cell of the embryo sac.
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| 4. | The megaspores become megagametophytes ( embryo sacs ).
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| 5. | A typical embryo sac contains seven cells and eight nuclei, one of which is the egg cell.
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| 6. | Oogenesis occurs within the embryo sac and leads to the formation of a single egg cell per ovule.
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| 7. | In angiosperms, the megagametophyte is reduced to only a few nuclei and cells, and is sometimes called the embryo sac.
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| 8. | In oaks, early fertilized ovules prevent the fertilization of other ovules by inhibiting the pollen tube entry into the embryo sac.
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| 9. | This process involves the joining of a female gametophyte ( megagametophyte, also called the embryo sac ) with two male gametes ( sperm ).
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| 10. | In flowering plants, the female gametophyte ( sometimes referred to as the embryo sac ) has been reduced to just eight cells inside the ovule.
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