Identify the correct statements
I) Microsporophylls and megasporophylls are formed on the same tree in Pinus
II) Microsporophyll and megasporophylls are formed on different trees in Cycas.
III) In Gymnosperms, multicellular female gametophyte is retained within the megasporangium.
IV) In Gymnosperms, the male and female gametophytes do not have independent existence.