The sequence of development of embryo sac is :

Options

A. Archesporium - Megaspore mother cell - Megaspore - Embryo sac
B. Archesporium - Megaspore -Megaspore mother cell - Embryo sac
C. Archesporium - Megaspore -Megasporophyte - Embryo sac
D. None of the above

Answer

To solve the question regarding the sequence of development of the embryo sac, we can break down the process step by step:

### Step-by-Step Solution:

1. **Archisporium Formation**: The development of the embryo sac begins with the formation of the archisporium. The archisporium is a group of cells that will give rise to the megaspore mother cell.

2. **Megaspore Mother Cell (MMC)**: From the archisporium, the megaspore mother cell (MMC) is formed. The MMC is a diploid cell that will undergo meiosis to produce megaspores.

3. **Meiosis and Megaspore Formation**: The megaspore mother cell undergoes meiosis, resulting in the formation of four haploid megaspores. Typically, three of these megaspores degenerate, leaving one functional megaspore.

4. **Embryo Sac Development**: The surviving megaspore then develops into the embryo sac. The embryo sac is the female gametophyte and contains the egg cell and other cells necessary for fertilization.

### Final Sequence:
Thus, the correct sequence of development of the embryo sac is:
1. Archisporium
2. Megaspore Mother Cell (MMC)
3. Megaspore
4. Embryo Sac

### Conclusion:
The correct answer to the question is the sequence starting from Archisporium, followed by Megaspore Mother Cell, Megaspore, and finally the Embryo Sac.