Female Gametophyte & Ploidy Levels — NEET Biology
✅ Asked in NEET 2019Female gametophyte: 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 monosporic development. What will be the ploidy of the cells of the nucellus, MMC, the functional megaspore and female gametophyte?
NTA tests whether you understand that the female gametophyte (embryo sac) develops from a single functional megaspore through monosporic development, and can determine ploidy levels at each stage. The nucellus and MMC (megaspore mother cell) are diploid (2n), while the functional megaspore and female gametophyte are haploid (n). Students commonly confuse the ploidy of megaspores with the MMC, or mistakenly think the embryo sac is diploid. Remember: meiosis produces haploid megaspores; only one survives and develops into the haploid embryo sac without any further reduction division. This concept bridges meiosis, gametogenesis, and ploidy—classic NEET territory.
This paragraph was tested 2 times in NEET.
Which one of the following statements regarding post-fertilisation development in flowering plants is incorrect? (NEET 2019)
Functional megaspore in an angiosperm develops into an (NEET 2017)
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