The development of a single embryo sac in ovule in which three megaspores degenerate after meiosis in MMC, is called

Options

A. Bisporic development
B. Monosporic development
C. Tetrasporic development
D. Trisporic development

Answer

To answer the question regarding the development of a single embryo sac in an ovule where three megaspores degenerate after meiosis in the megaspore mother cell (MMC), we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Megasporogenesis**:
- Megasporogenesis is the process of forming megaspores or embryo sacs from the megaspore mother cell (MMC). The MMC is diploid (2n).

2. **Meiosis in MMC**:
- The MMC undergoes meiosis, which is a type of cell division that reduces the chromosome number by half. This process consists of two meiotic divisions.
- After the first meiotic division, the MMC divides to form two haploid cells (n).
- After the second meiotic division, these two cells divide again to produce a total of four haploid megaspores.

3. **Degeneration of Megaspores**:
- In the scenario described, three out of the four megaspores degenerate, leaving only one functional megaspore.

4. **Formation of the Embryo Sac**:
- The remaining megaspore develops into the embryo sac. This process is crucial for the development of the female gametophyte in flowering plants.

5. **Terminology**:
- The type of development where only one megaspore survives and develops into an embryo sac is referred to as **monosporic development**. The prefix "mono-" means single, indicating that only one megaspore is involved in the formation of the embryo sac.

6. **Conclusion**:
- Therefore, the development of a single embryo sac from the degeneration of three megaspores is called **monosporic development**.

### Final Answer:
The development of a single embryo sac in ovule in which three megaspores degenerate after meiosis in MMC is called **monosporic development**.