Explain the structure of mature female gametophyte with the help of a neat labelled diagram.

Explanation

After the 8 - nucleate stage, cellwalls are laid down leading to the organisation of female gametophyte/embryosac. Six of the eight nuclei, are surrounded by cell wall and are organised into cells and the remaining two nuclei are called polar nuclei.
There is a characteristic distribution of cells within the embryo. Three cells are grouped together at the micropylar end and constitute egg apparatus. The egg apparatus inturn is composed of synergids and one egg cell. Synergids have special cellular thickening at the micropylar tip called filiform apparatus, which play a very important role in guiding pollen tube into the synergids. Three cells are at the chalazal end and are called antipodals.