Heterosporous condition and ligulate leaves are found in

The heart-shaped prothallus of a fern bears:

The evolutionary advanced features of $Selaginella$ are:
$(a)$ Heterospory
$(b)$ Endosporic development of gametophyte
$(c)$ Reduced gametophyte
$(d)$ Localization of sporangium-bearing appendages in strobili
$(e)$ Unisexual gametophytes
$(f)$ Fertilization with the help of water

According to available fossil records,which of the following were the first land vascular plants?

$Nephrolepis$ is a:

Which one of the following is heterosporous?