In gymnosperms,the ovule is naked because

Consider the following statements regarding gymnosperms and choose the correct option.
$I.$ In gymnosperms,the male and female gametophytes have an independent existence.
$II.$ The multicellular female gametophyte is retained within the megasporangium.
$III.$ The gymnosperms are heterosporous.
Of these statements:

In which one of the following do male and female gametophytes not have a free-living independent existence?

In $Cycas$,pollination is by

Three generations one within the other are present in the seeds of

Plants that bear open or naked seeds are known as ........