Multiple choice The Polygonum type of embryo sac is bisporic eight-nucleate monosporic four-nucleate tetrasporic sixteen-nucleate monosporic eight-nucleate Reveal answer Fill a bubble to check yourself D Correct answer Explanation The Polygonum type of embryo sac is the most common type in angiosperms. It develops from a single megaspore (monosporic) and undergoes three rounds of mitosis to form eight nuclei.