What is monosporic embryo sac?

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Detailed Solution

A monosporic embryo sac is a female gametophyte in flowering plants that develops from one functional megaspore, typically forming the 8-nucleate, 7-celled Polygonum-type structure.

Process

Megasporogenesis produces four megaspores by meiosis from a megaspore mother cell.
Three degenerate; one functional megaspore remains.
This single megaspore undergoes three mitotic divisions → 8 nuclei.
Cellular organization: egg apparatus (1 egg + 2 synergids), 3 antipodals, and 2 polar nuclei that fuse to form the central cell’s secondary nucleus.

Features

Most common pathway in angiosperms.
Genetically haploid and derived from one spore, hence “monosporic.”
Ready for double fertilization: one sperm fuses with egg, the other with central cell to form endosperm.

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