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