Which of the following pteridophytes is heterosporous in nature?

Give scientific reasons: In pteridophytes,the development of the zygote inside the female gametophyte is considered an important phase.

Plants that possess vascular tissues but lack seeds are known as .......

Which of the following venation is characteristic of ferns?

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 a homosporous pteridophyte?