In gymnosperms, the pollen chamber represents (A) a cell in the pollen grain, in which the sperm...

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In gymnosperms, the pollen chamber represents
(A) a cell in the pollen grain, in which the sperms are formed
(B) a cavity in the ovule, in which pollen grains are stored after pollination
(C) an opening in the megagametophyte through, which the pollen tube approaches an egg
(D) the microsporangium, in which pollen grains develop
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