Which of the following structures are haploid in gymnosperms? (a) Pollen grain, megaspore, embry...

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Which of the following structures are haploid in gymnosperms?
(a) Pollen grain, megaspore, embryo
(b) Pollen grain, megaspore, endosperm
(c) Megaspore, leaf, root
(d) Leaf, root, integument
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