Question

The sequence of development during the formation of endosperm is

• A. Archesporium $\to$ Megaspore mother cell $\to$ Megaspore $\to$ Embryo sac
• B. Archesporium $\to$ Megaspore $\to$ Megaspore mother cell $\to$ Embryo sac
• C. Megaspre $\to$ Archesporium $\to$ Megaspore Mother cell $\to$ Embryo sac
• D. Megaspore mother cell $\to$ spore mother cell $\to$ Embryo spore mother cell $\to$ Embryo sac

Answer 1

The correct option is A Archesporium $\to$ Megaspore mother cell $\to$ Megaspore $\to$ Embryo sac

• Archesporium is a group of cells that develops megaspore mother cells. The megaspore mother cell of megasporangium undergoes meiosis and forms megaspore tetrad out of which one megaspore is functional.
• Three successive mitotic divisions in the megaspore produce eight nucleated embryo sac.
• The triple fusion of central cell with one of the male gamete forms endosperm. Hence, the correct sequence is Archesporium → Megaspore mother cell → Megaspore → Embryo sac.

So, the correct answer is option A.