How are the male and female gametophytes of pteridophytes and gymnosperms different from each other?

The heterosporous pteridophytes show certain characteristics, which are precursor to the seed habit in gymnosperms. Explain.

Comment on the lifecycle and nature of a fern prothallus.

In which plant will you look for mycorrhiza and corolloid roots? Also explain what these terms mean.

Gametophyte is a dominant phase in the life cycle of a bryophyte. Explain.