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What happen to haploid megaspores formed by megaspore mother cell in an angiospermic plant? 

Megaspore - an overview | ScienceDirect Topics

  • a)
    Upper three degenerate and lower one produce embryo sac

  • b)
    Upper 2 degenerate and lower two produce embryo sac

  • c)
    Upper one produce embryo and lower 3 degenerate

  • d)
    All four produce 4 embryo sac

Correct answer is option 'A'. Can you explain this answer?
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Formation of Haploid Megaspores in Angiosperms

In angiosperms, the megaspore mother cell undergoes meiosis to form four haploid megaspores.

Fate of Haploid Megaspores

- Three of the four haploid megaspores degenerate, while the remaining haploid megaspore undergoes mitosis to form the female gametophyte, also known as the embryo sac.
- The three degenerate megaspores provide nourishment to the developing embryo sac.

Formation of Embryo Sac

- The haploid megaspore undergoes three rounds of mitosis to form the embryo sac.
- The first mitosis produces two nuclei, one at each end of the cell.
- The second mitosis produces four nuclei, two at each end of the cell.
- The third mitosis produces eight nuclei, with one large central cell containing two nuclei and six smaller cells, each containing one nucleus.

Conclusion

Therefore, in angiosperms, the upper three haploid megaspores degenerate, while the lower haploid megaspore produces the embryo sac through three rounds of mitosis.
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What happen to haploid megaspores formed by megaspore mother cell in an angiospermic plant?a)Upper three degenerate and lower one produce embryo sacb)Upper 2 degenerate and lower two produce embryo sacc)Upper one produce embryo and lower 3 degenerated)All four produce 4 embryo sacCorrect answer is option 'A'. Can you explain this answer?
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