What is megasporogenesis? Explain the development of eight nucleate embryosac in flowering plants.

Explanation

The process of formation of megaspores from the megaspore mother cell (MMC) is called megasporogenesis.
In a majority of flowering plants, one of the megaspores is functional while the other three degenerate. Only the functional megaspore develops into the female gametophyte (embryo sac). This method of embryo sac formation from a single megaspore is termed as monosporic development
The nucleus of the functional megaspore divides mitotically to form two nuclei which move to the opposite poles, forming the 2-nucleate embryo sac.
Two more sequential mitotic nuclear divisions result in the formation of the 4-nucleate and later the 8-nucleate stages of the embryo sac.
After 8-nucleate stage, cell walls are laid down leading to the organization of the typical female gametophyte or embryo sac.
In the observation, six of the eight nuclei are surrounded by cell walls and organized into cells, the remaining two nuclei called polar nuclei are situated at the central region.