The jacket of the fern antheridium is composed of: (in $cells$)

Which of the following plant groups possesses spores and vascular tissues but is seedless?

In $Selaginella$,when the sporophyte develops directly from the female gametophyte other than the oosphere,the condition is called:

Which of the following is a correctly matched pair?

In pteridophytes,the sporophylls may form distinct compact structures called .....

Rhizophore in $Selaginella$ is