In polygonum type of embryo sac, the cells are

Options

A. Haploid
B. Diploid
C. Both A and B
D. Poiyploid

Answer

To answer the question regarding the cells in the Polygonum type of embryo sac, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding the Polygonum Type of Embryo Sac**:
- The Polygonum type of embryo sac is the most common type found in flowering plants.

2. **Origin of the Megaspore**:
- It starts with a diploid megaspore mother cell (also known as the megasporangium) located within the ovule's nucellus.

3. **Meiosis Process**:
- The diploid megaspore mother cell undergoes meiosis, a reductional division, resulting in the formation of four haploid megaspores.

4. **Functional Megaspore**:
- Out of the four haploid megaspores produced, only one remains functional while the other three degenerate.

5. **Mitosis of the Functional Megaspore**:
- The functional megaspore undergoes mitosis three times without any cytoplasmic divisions. This results in a total of eight nuclei within the megaspore.

6. **Organization of Nuclei**:
- The eight nuclei organize into specific structures:
- Three nuclei form the egg apparatus, which consists of one egg cell and two synergids at the micropilar end.
- Two nuclei form a large central cell.
- Three nuclei become the antipodal cells located at the chalazal end.

7. **Formation of the Central Cell**:
- The two polar nuclei in the central cell fuse before fertilization, creating a diploid secondary nucleus.

8. **Final Structure of the Embryo Sac**:
- The final structure of the Polygonum type embryo sac is a 7-celled, 8-nucleated structure, containing both haploid and diploid cells.

9. **Conclusion**:
- Therefore, in the Polygonum type of embryo sac, we find both haploid cells (from the egg apparatus and antipodal cells) and diploid cells (from the central cell). Thus, the correct answer to the question is "both A and B."

### Final Answer:
The cells in the Polygonum type of embryo sac are both haploid and diploid.

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