Multiflagellate male gametes (sperms) are found in

$S$: In $Pteridophytes$,spores are produced in sporangia.
$R$: In $Pteridophytes$,sporangia are produced on sporophylls.

The shape of the sporangium in ferns is

Apical growth of the lower vascular plants takes place by an apical cell. This cell is generally pyramidal. Though four-sided in shape,it is often referred to as a three-sided cell because

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

The species that grows on open rocks is known as: