What is the direct formation of a gametophyte from a sporophyte called?

Which of the following require water for gamete transfer?

Into how many groups are the non-flowering plants (Cryptogams) classified?

Choose the correct option with respect to the features of different plant groups.
Group $\quad$ Embryo $\quad$ Gametes $\quad$ Asexual spore

In which of the following groups do the male and female gametophytes have independent,free-living existence?

Flagellated male gametes are present in all the three of which one of the following sets?