Trabeculae is the transformation of

'Male shield fern' is:

$Selaginella$ is heterosporous. It produces two types of spores. The microspore develops into microgametophyte and the megaspore develops into megagametophyte. With respect to gametophyte,which one statement is correct?

In Pteridophytes,how are the sporophylls arranged?

Meiosis is seen in pteridophytes during which process?

Which of the following is considered the first terrestrial plant?