Fern prothallus is developed from

The first plants to appear after a forest fire are the ferns. This is because of the survival of their:

How many structures listed below are diploid $(2n)$ for a typical fern member?
$a.$ Indusium cell
$b.$ Stomium cell
$c.$ $NCC$ (Neck Canal Cell)
$d.$ Rhizome cell
$e.$ Sporophyll cell
$f.$ Prothallus cell
$g.$ $SMC$ (Spore Mother Cell)
$h.$ Spore
$i.$ Antherozoid mother cell

Ligulate leaves are found in

In the case of heterosporous pteridophytes,the gametophyte is:

Assertion $(A)$: $Selaginella$ is heterosporous.
Reason $(R)$: The strobili of $Selaginella$ are unisexual.