A cell of the embryosac of angiosperm which is initially dikaryotic and haploid and later becomes uninucleate and diploid is

Options

A. Egg cell
B. Synergid
C. Antipodal cell
D. Central cell

Answer

To solve the question regarding the cell of the embryo sac of angiosperms that is initially dikaryotic and haploid, and later becomes uninucleate and diploid, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Embryo Sac**:
- The embryo sac in angiosperms is a structure that contains the female gametes. It typically consists of seven cells with eight nuclei.

2. **Identifying Cell Types**:
- The embryo sac contains several types of cells:
- **Egg Cell**: A single haploid cell.
- **Synergids**: Two haploid cells that assist in fertilization.
- **Antipodal Cells**: Three haploid cells located at the opposite end of the egg apparatus.
- **Central Cell**: This is the key focus of our question.

3. **Dikaryotic and Haploid Condition**:
- The question specifies a cell that is initially dikaryotic (two nuclei) and haploid (n). In the case of the central cell, it contains two polar nuclei, which means it is dikaryotic.

4. **Transition to Uninucleate and Diploid**:
- After fertilization, the central cell fuses with one of the sperm cells from the pollen grain. This fusion results in the formation of a diploid nucleus (2n), making it a single nucleus (uninucleate) that is diploid.

5. **Conclusion**:
- Therefore, the cell that fits all these criteria is the **Central Cell** of the embryo sac. Initially, it is dikaryotic and haploid due to the presence of two polar nuclei, and after fertilization, it becomes uninucleate and diploid.

### Final Answer:
The cell of the embryo sac of an angiosperm which is initially dikaryotic and haploid and later becomes uninucleate and diploid is the **Central Cell**.

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