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Megasporogenesis
Concepts tested here
- Development of embryo sac
All Questions
2011 AIPMT-MAINS 1 question
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In angiosperms, functional megaspore develops intoIn the ovule, the megaspore mother cell undergoes meiosis to form four haploid megaspores.
In most flowering plants three of them degenerate and only one remains functional.
The nucleus of the functional megaspore divides mitotically three times (free nuclear divisions) to give 8 nuclei, which organise into the 7-celled, 8-nucleate female gametophyte.
This female gametophyte is the embryo sac; its formation from a single megaspore is called monosporic development.
Endosperm is formed after triple fusion, the pollen sac is the microsporangium, and the ovule is the structure that contains the embryo sac.
Hence the functional megaspore develops into the embryo sac.