The ploidy level of nucellus and female gametophyte respectively is

Options

A. n,n
B. n,2n
C. 2n,n
D. 2n,2n

Answer

To determine the ploidy level of the nucellus and the female gametophyte, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Nucellus**:
- The nucellus is a tissue found within the ovule of flowering plants. It is located between the integument layers and serves as the nutritive tissue for the developing egg cell.

2. **Determine the Ploidy Level of the Nucellus**:
- The nucellus is derived from the ovule, which is part of the diploid sporophyte generation of the plant. Therefore, the ploidy level of the nucellus is diploid (2n).

3. **Identify the Female Gametophyte**:
- The female gametophyte develops from the megasporangium (nucellus) through a process involving meiotic division of the megasporocyte (mother cell).

4. **Determine the Ploidy Level of the Female Gametophyte**:
- The megasporocyte is diploid (2n) and undergoes meiosis to produce four haploid (n) megaspores. Typically, only one of these megaspores develops into the female gametophyte, which is therefore haploid.

5. **Conclusion**:
- The ploidy levels of the nucellus and the female gametophyte are respectively 2n (diploid) for the nucellus and n (haploid) for the female gametophyte.

### Final Answer:
- The ploidy level of the nucellus is 2n and the female gametophyte is n.