Eight nucleate embryo sacs are

Options

A. always tetrasporic
B. always monosporic
C. always bisporic
D. sometimes monosporic, sometimes bisporic and sometimes tetrasporic

Answer

D

Explanation

Megaspore is a haploid structure which divides and gives rise to embryo sac which is also called as female gametophyte.
Eight-nucleate embryo sacs may be monosporic (e.g. Polygonum) or bisporic (e.g. Allium) or tetrasporic (e.g. Adoxa)