Correct option is A
The correct answer is (a).
Allium is known to have a bisporic type of embryo sac development. In bisporic development, two cells from the megaspore mother cell participate in the formation of the embryo sac. This results in a unique form of embryo sac with a reduced number of cells, typically involving two functional cells from the megaspore, compared to the monosporic (involving one cell) or tetrasporic (involving four cells) forms.
Incorrect options
(b) is incorrect because Oenothera is an example of tetrasporic development, where all four nuclei from meiosis are involved in embryo sac formation.
(c) is incorrect because Plumbago also shows tetrasporic development, not bisporic.
(d) is incorrect because Polygonum is the classic example of monosporic embryo sac development.
