One diploid (2N) megaspore mother cell Undergo meiosis and form 4 haploid (N) megaspores by the process known as Megasporogenesis... ________
Out of which three degenerate and only one becomes functional megaspore which is HAPLOID (N) & give rise to female gametophyte or Embryo sac

Ploidy of Functional Megaspore

The ploidy of cells of functional megaspore is haploid. This means that these cells contain only one set of chromosomes, which is half the number found in diploid cells.

Formation of Functional Megaspore
- The functional megaspore is formed through the process of megasporogenesis in the ovule of angiosperms.
- During megasporogenesis, a diploid cell in the ovule undergoes meiosis to produce four haploid megaspores.
- Out of these four megaspores, only one will survive and develop into the functional megaspore.

Role of Functional Megaspore
- The functional megaspore will then undergo further development to form the female gametophyte, also known as the embryo sac.
- The female gametophyte contains the egg cell, which will eventually fuse with the sperm cell during fertilization to form a zygote.

Significance of Haploid Ploidy
- The haploid ploidy of the functional megaspore ensures that when fertilization occurs, the resulting zygote will have the correct number of chromosomes.
- This is essential for maintaining the genetic stability of the offspring and ensuring proper development.

In conclusion, the cells of the functional megaspore are haploid, playing a crucial role in the reproductive process of angiosperms.