Answer:
Megaspore mother cell
Megaspores
Embryo sac (n)
The diploid Megaspore Mother Cell
(MMC)undergo meiosis and forms a linear tetrad of fourhaploid megaspores. Three
mitotic divisions, inside the functional (one) megaspore formthe embryo sac
(eight haploid nuclei), while the other three megaspores degenerate.The embryo
sac is a seven-celled and eight nucleated structure. Three micropylar. Threechalazal
and one central. The three micropylar cells are collectively known
asegg-apparatus, which, consists of two synergids and one egg cell.While three
chalazal cell form antipodal cell. The central cell is in the form of two nucleated
cell till the fertilization occurs and called as polar nuclei.
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