In a flower, if the megaspore mother cell forms magaspores without undergoing meiosis and if one of the magaspores develops into an embryo sac, its nuclei would be

Options

A. haploid
B. diploid
C. a few haploid and a few diploid
D. with varying ploidy

Answer

To solve the question regarding the ploidy of the nuclei in the embryo sac formed from a megaspore that did not undergo meiosis, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Megaspore Mother Cell**:
- The megaspore mother cell (MMC) is typically diploid (2n) and undergoes meiosis to produce four haploid (n) megaspores.

2. **Meiosis and Its Role**:
- Normally, meiosis is a reduction division that reduces the chromosome number by half, resulting in haploid cells. If the MMC undergoes meiosis, it would produce four haploid megaspores.

3. **Condition of the Question**:
- The question states that the megaspore mother cell forms megaspores without undergoing meiosis. This means it does not reduce its chromosome number.

4. **Formation of Megaspores**:
- Since the MMC does not undergo meiosis, it remains diploid and can directly form megaspores. In this case, the megaspores formed will also be diploid (2n).

5. **Development into Embryo Sac**:
- If one of these diploid megaspores develops into an embryo sac, the nuclei within the embryo sac will retain the diploid state.

6. **Conclusion**:
- Therefore, the nuclei of the embryo sac that develops from the megaspore formed without meiosis will be diploid (2n).

### Final Answer:
The nuclei would be **diploid (2n)**.