Which structure is part of Pinus contorta reproduction, but not part of fern reproduction? micropyle gametophyte protonema sporophyte

The correct answer is Micropyle.

The micropyle can be defined as opening in the ovum that allows the pollen to enter into it for the process of fertilization. In gymnosperm the pollen is drawn into the ovule on a drop of fluid that comes out of the micropyle, called as pollination drop mechanism. Micropyle is present in gymnosperm and absent in pteridophytes.