Which of the following are homosporous?

The number of spores in the sporangium of a fern is

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.

Which of the following is included in the class $Sphenopsida$?

Xylem vessels and phloem companion cells are generally absent in

Which of the following is a characteristic of $Pteridophytes$?