Winged seeds are found in

How many families were included in the group Gymnospermae by Bentham and Hooker?

The fossils of $Williamsonia$ were first discovered by .......

Coralloid roots help $Cycas$ in:

With respect to the life cycle of $Pinus$,considering the formation of the female cone in the summer of year $0$,when does fertilization occur?

In gymnosperms,the microsporangium represents .......... .