Describe the development of embryo sac?

Development of embryosac (also known as monosporic development) archegonial cell present in the nucellus divides periclinally to form outer primary parietal cell and inner primary sporogenous cell . With time parietal cell denerates and sporonenous tissue behaves as megaspore mother cell. Meosis in MMC results in production of 4 haploid cell. With time 3 cells of micropyler end get denerates and 1cell at chalazal end remain functional and called functional megaspore . Functinal megaspore turn over 3 mitosis results in 8 haploid cells 4 at micropyler end and 4 at chalazal end Now 1 cell from each end comes in center to form secondary nucleus and remaning 3 cells of micropyler end form egg appratus and remaining 3 cells of chalazal end form antipodals Egg apparatus consists of two haploid synergid and 1 egg This is the development of embryosac