The functional megaspore develops after three successive mitotic division into

Options

A. embryo
B. embryo sac
C. ovule
D. zygote

Answer

To answer the question, "The functional megaspore develops after three successive mitotic divisions into," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Functional Megaspore**:
- The functional megaspore is the first cell of the female gametophyte in flowering plants. It is haploid, meaning it has a single set of chromosomes (n).

2. **Mitosis of the Functional Megaspore**:
- The nucleus of the functional megaspore undergoes three successive mitotic divisions. Each division results in the duplication of the nucleus without the cell dividing, leading to an increase in the number of nuclei.

3. **Counting the Nuclei**:
- After three rounds of mitotic division, the functional megaspore produces a total of eight nuclei.

4. **Arrangement of the Nuclei**:
- These eight nuclei are arranged in a specific manner within the developing female gametophyte:
- 2 polar nuclei
- 3 antipodal cells
- 1 egg cell
- 2 synergid cells

5. **Formation of the Embryo Sac**:
- The structure that contains these eight nuclei is known as the embryo sac. The embryo sac is the mature female gametophyte that results from the development of the functional megaspore.

6. **Conclusion**:
- Therefore, after three successive mitotic divisions, the functional megaspore develops into the embryo sac.

### Final Answer:
The functional megaspore develops after three successive mitotic divisions into **embryo sac**.

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