The embryo sac is known to be the site of zygote formation. The embryo sac is the site where zygote formation takes place. The embryo sac or female gametophyte is an oval shape present inside the ovule of flowering plants. An embryo sac formation takes place after the division of haploid megaspore nuclei. It possesses haploid nuclei and 6 haploid cells which now no longer have cell walls.
Once fertilization takes place, the sepals, petals, and stamens of the flower wither and fall off.
The pistil, however, stays connected to the plant. The zygote then develops into the new part which is known as an embryo and the ovules change into the seed.
The ovary develops into the fruit which develops a thick wail referred to as pericarp that is shielding in function.
In the end, Ovule develops into seed and ovary into fruit.