The ploidy of Nucellus, MMC n functional megaspores is DIPLOID n the ploidy of Female gametophyte is HAPLOID.

The ploidy of cells in the nucellus, MMC (megaspore mother cell), functional megaspore, and female gametophyte can vary depending on the specific stage of development and the plant species. These cells are involved in the process of female gametogenesis, which leads to the production of the female gametes necessary for sexual reproduction in plants.

1. Nucellus:
The nucellus is a part of the ovule, which is the structure that gives rise to the female reproductive cells. The ploidy of the cells in the nucellus can vary depending on the plant species. In most angiosperms, the cells of the nucellus are typically diploid (2n) cells.

2. MMC (Megaspore Mother Cell):
The MMC, also known as the megasporocyte, is a diploid cell that undergoes meiosis to produce haploid megaspores. During meiosis, the MMC divides twice, resulting in the formation of four haploid megaspores. Thus, the ploidy of the MMC is diploid (2n).

3. Functional Megaspore:
Out of the four megaspores produced by the MMC, only one megaspore typically survives and develops into the functional megaspore. The other three megaspores usually degenerate. The functional megaspore is a haploid (n) cell, as it is the result of the reduction division (meiosis) of the diploid MMC.

4. Female Gametophyte:
The functional megaspore undergoes several rounds of mitotic divisions to form the female gametophyte, also known as the embryo sac. The female gametophyte is a multicellular structure that contains the female gametes. In most flowering plants, the female gametophyte consists of seven cells and eight nuclei. These cells include three antipodal cells, two synergid cells, the egg cell, and two polar nuclei. The ploidy of these cells is typically haploid (n).

In summary, the ploidy of the cells in the nucellus is diploid (2n), the MMC is diploid (2n) undergoing meiosis to produce haploid megaspores, the functional megaspore is haploid (n), and the cells of the female gametophyte are haploid (n).