A) Megaspore, integument, root
B) Endosperm, megaspore, pollen grain
C) Pollen grain, leaf, root
D) Megaspore, endosperm, embryo
Correct Answer: B
Solution :
Because endosperm is haploid (n) and formed before fertilization and megaspore mother cell divides reductionally to form a linear tetrad of haploid megaspores and microspore ( = pollengrain) is the first stage of the gametophyte (n).
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