Mesarch xylem is common in

$A:$ In Pteridophytes,spores are produced in sporangia. $R:$ In Pteridophytes,sporangia are subtended by leaf-like appendages called sporophylls.

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

$A$: 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.

Which of the following is an aquatic and free-floating fern?

Which of the following pteridophytes belongs to the class $Pteropsida$?