In the mature embryo sac, the cells closest to where the pollen tube enters the ovule (the micropyle) are the

The answer is egg cell and the synergids. Synergid cells are located in the female gametophyte and are essential for angiosperm reproduction. during the fertilization process, a pollen tube grows into one of the synergid cells, ceases growth, raptures and releases its two sperm cells into this cell.