Horse tails and ferns belong to which group?

The leaves of pteridophytes are .....

Apogamy is

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

The number of male prothallial cells in $Selaginella$ is:

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?