The main plant body of $Selaginella$ $sp.$ is

In $Pteridophytes$,meiosis occurs during which of the following processes?

In $Dryopteris$ (fern),meiosis occurs during:

How many of the following statements are true about $Azolla$?
$(a)$ It is free-floating.
$(b)$ It has bilobed leaves.
$(c)$ It is nitrogen-fixing.
$(d)$ It is a climber.
$(e)$ It has Aerenchyma in the ventral lobe of the leaf.

Archegonia and antheridia in homosporous pteridophytes are present in:

Vascular cryptogams or seedless vascular plants are included in .......