Identify $X$ from the figure.

What is true for the plant shown in the given figure?

To which of the following groups would you assign a plant that has a vascular supply,lacks ovules,and reproduces by means of spores?

Which of the following is not heterosporous?

Classify pteridophytes into their four main groups and provide an example for each.

In $Selaginella$,reduction division occurs during the formation of