Which one of the following plants is monoecious?

Flagellated cells are absent in .........

The kingdom characterized by the presence of a rigid cell wall and the formation of an embryo is ......... .

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Gymnosperms	$(p)$ Trimerous flowers
$(b)$ Monocots	$(q)$ Absence of flowers
$(c)$ Dicots	$(r)$ Primitive type of flowers
$(d)$ Pteridophytes	$(s)$ Tetramerous or pentamerous flowers

Explain briefly the following terms with suitable examples:
$(i)$ protonema
$(ii)$ antheridium
$(iii)$ archegonium
$(iv)$ diplontic
$(v)$ sporophyll
$(vi)$ isogamy

The gametophytic plant body is nonvascular in which of the following?