Which one of the following belongs to vascular cryptogams?

$A$: Events precursor to the seed habit are seen in some members of pteridophytes.
$R$: Development of the zygotes into young embryos takes place within the female gametophyte.

In which of the following plants is the diploid stage generally dominant?

The jacket of the fern antheridium is composed of: (in $cells$)

In $Pteridophytes$ / $Dryopteris$,meiosis occurs at the time of:

Which of the following is not heterosporous?