The rhizophore in $Selaginella$ is:

The seed habit was first established in .........

In $Dryopteris$,the antherozoids are

In which plant group is the gametophytic phase reduced, haploid, short-lived, and subterranean?

$A$: Seeds are formed by some species of spike moss.
$R$: All conditions for seed habit are fulfilled by these species of spike moss.

To which group does the plant shown in the given figure belong?