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

Options

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

Answer

To solve the question regarding the arrangement of the nuclei in a normal embryo sac in dicot plants, let's break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Structure of the Embryo Sac**:
- The embryo sac is the female gametophyte in flowering plants, particularly in dicots.
- It typically contains a total of seven cells, which include various types of cells with specific functions.

2. **Identifying the Types of Cells**:
- **Antipodal Cells**: There are three antipodal cells located at the chalazal end of the embryo sac. Each of these cells contains a single nucleus.
- **Central Cell**: In the center of the embryo sac, there is one central cell that contains two nuclei (this is often referred to as the polar nuclei).
- **Egg Cell**: At the micropylar end, there is one egg cell that contains a single nucleus.
- **Synergids**: There are two synergid cells located near the egg cell, and each of these also contains a single nucleus.

3. **Counting the Nuclei**:
- From the above information, we can summarize the nuclei as follows:
- Antipodal cells: 3 nuclei (1 nucleus per cell × 3 cells)
- Central cell: 2 nuclei
- Egg cell: 1 nucleus
- Synergid cells: 2 nuclei (1 nucleus per cell × 2 cells)

4. **Totaling the Nuclei**:
- Now, we add the nuclei together:
- Antipodal (3) + Central (2) + Egg (1) + Synergids (2) = 3 + 2 + 1 + 2 = 8 nuclei in total.

5. **Conclusion**:
- The arrangement of the nuclei in a normal embryo sac in dicot plants is therefore a total of 8 nuclei.

### Final Answer:
The arrangement of the nuclei in a normal embryo sac in dicot plants is 8 nuclei (3 antipodal + 2 central + 1 egg + 2 synergids).