With a neat,labelled diagram,describe the parts of a mature angiosperm embryo sac. Mention the role of synergids.

(N/A) mature angiosperm embryo sac is typically $8$-nucleate and $7$-celled.
$1$. Egg Apparatus: Located at the micropylar end,it consists of two synergids and one egg cell.
$2$. Antipodal Cells: Three cells located at the chalazal end are called antipodals.
$3$. Central Cell: The large central cell contains two polar nuclei,which eventually fuse to form a diploid secondary nucleus.
Role of Synergids: Synergids possess special cellular thickenings at the micropylar tip called the filiform apparatus. This apparatus plays a crucial role in guiding the pollen tube into the synergid.