In ferns,young leaves are protected by

In ferns,spores are formed in

The place where the sporangium of a fern bursts open is called:

How far does $Selaginella$,one of the few living members of $Lycopodiales$ $(pteridophytes)$,fall short of the seed habit?

The fern $Dryopteris$ is:

$Selaginella$ is heterosporous. It produces two types of spores. The microspore develops into microgametophyte and the megaspore develops into megagametophyte. With respect to gametophyte,which one statement is correct?