In the prothallus of $Dryopteris$ (fern),the sex organs are located as follows:

The main plant body is differentiated into true root,stem,and leaves in:

Which of the following represents the correct sequence in Pteridophytes?

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

Read carefully the following statements about sexual reproduction in ferns:
$I.$ Water is essential for fertilization.
$II.$ The male gametophyte bears antheridia,while the female gametophyte bears archegonia,which produce antherozoids and egg cells,respectively.
$III.$ Antherozoids and egg cells fuse to give rise to a zygote. The zygote develops into a young embryo. The embryo gives rise to a sporophyte.
Which of the statements given above are correct?

$A$: 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.