The first evolution of the seed habit occurred in which of the following?

$A$: 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.

"Botanical snakes" are

$A$: In $Equisetum$,sexual reproduction occurs through sex organs like antheridia and archegonia.
$R$: In pteridophytes,the gametophytic stage is long-lived and responsible for sexual reproduction.

In $Selaginella$,the embryo develops into:

Strobili or cones are found in