Question

What is monosporic development?

Answer 1

It refers to the development of an embryo sac from a single megaspore.
#Hope it helps.

Answer 2

In most flowering plants, a single megaspore mother cell present at the micropylar pole of the nucellus region of the ovule undergoes meiosis to produce four haploid megaspores. Later, out of these four megaspores, only one functional megaspore develops into the female gametophyte, while the remaining three degenerate.