Which of the following structures in Pinus are haploid

Options

A. Megaspore,integument, root
B. Endosperm,megaspore,pollen grain
C. Pollen grain, leaf, root
D. Megaspore,endosperm,embryo

Answer

b

Explanation

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).