The jacket of the fern antheridium is composed of: (in $cells$)

In some pteridophytes, sporophylls form distinct compact structures called $A$ in $B$ and $C$. Here $A, B$, and $C$ refer to:

Leaves that produce microspores and megaspores are called:

In pteridophytes,spores germinate to give rise to

In which of the following plant groups is a haplo-diplontic life cycle observed?

Heterospory,i.e.,the formation of two types of spores—microspores and megaspores—is a characteristic feature in the life cycle of a few members of pteridophytes and all spermatophytes. Do you think heterospory has some evolutionary significance in the plant kingdom?