AAllium
BEndymion
COenothera
DPolygonum
Answer:
B. Endymion
Read Explanation:
The formation of the embryo sac from a single megaspore is termed as monosporic development.
In Endymion (also known as Scilla), a genus of flowering plants in the family Asparagaceae, the embryo sac development follows a specific pattern.
Typically, in monosporic development, one of the four megaspores formed after meiosis degenerates, and the functional megaspore develops into the embryo sac.
In the Endymion type of embryo sac development, it is specifically the micropylar dyad cell that undergoes further development to form the embryo sac.
This is a deviation from other common types of monosporic development like the *Polygonum* type, where the chalazal megaspore is usually functional.
The development in Endymion involves the functional megaspore undergoing three successive mitotic divisions to form an eight-nucleate embryo sac.