A) always bisporic
B) always tetrasporic
C) always monosporic
D) sometimes monosporic, sometimes bisporic and sometime tetrasporic
Correct Answer: D
Solution :
Megaspore is a haploid structure, which divides and gives rise to embryo sac, is also called as female gametophyte. Eight-nucleate embryo sacs may be monosporic (eg, Polygonum); or bisporic (eg, Allium); or tetrasporic (eg, Adoxa).
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