The arrangement of the nuclei in a normal embryo sac in the dicot plants is

Options

A. 3+3+2
B. 2+3+3
C. 3+2+3
D. 2+4+2

Answer

To determine the arrangement of the nuclei in a normal embryo sac in dicot plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Embryo Sac**:
- The embryo sac is a structure within the ovule of flowering plants, specifically in angiosperms. In dicots, it is formed from the functional megaspore.

2. **Formation of Nuclei**:
- The functional megaspore undergoes mitotic divisions. Initially, one megaspore divides to form two nuclei, then these nuclei divide again to form four nuclei, and finally, they divide once more to produce a total of eight nuclei.

3. **Arrangement of Nuclei**:
- The eight nuclei are arranged in specific regions of the embryo sac:
- **Antipodal Cells**: Located at the chalazal end, there are three nuclei.
- **Central Cell**: In the middle of the embryo sac, there are two nuclei.
- **Egg Apparatus**: At the micropylar end, there are three nuclei, which include one egg cell and two synergids.

4. **Final Arrangement**:
- Therefore, the arrangement of the nuclei in the embryo sac of dicots is:
- Antipodal cells: 3 nuclei
- Central cell: 2 nuclei
- Egg apparatus: 3 nuclei
- This leads to the final arrangement of 3 + 2 + 3.

5. **Conclusion**:
- The correct option that represents the arrangement of the nuclei in a normal embryo sac in dicot plants is **3 + 2 + 3**.

### Answer:
The arrangement of the nuclei in a normal embryo sac in dicot plants is **3 + 2 + 3**.

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