In ferns,young leaves are protected by

Dispersal of spores in fern takes place through

Brown hair found at the base of $Pteris$ leaves are:

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.

Horsetails and ferns belong to which of the following groups?

In $Dryopteris$,which of the following statements is correct regarding its life cycle?