The stele found in ferns is known as:

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.

What is required for fertilization in the plant shown in the given figure?

In pteridophytes,the germination of spores leads to the formation of:

The main plant body of a pteridophyte is

Photosynthetic sporophylls are found in . . . . . . .