a cavity in the ovule in which pollen grains are stored after pollination
an opening in the megagametophyte through which the pollen tube approaches the egg
the microsporangium in which pollen grains develop
a cell in the pollen grain in which the sperms are formed.
Solution
In gymnosperms, pollen chamber represents the microsporangium in which pollen grains develop. The microspore is generally a globular sac like structure having large number of microspores. The microspores are also termed as pollen grains.