Both vessels and companion cells are absent in

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

Which of the following series is included in the subclass Gamopetalae?

Match Column-$I$ with Column-$II$ and select the correct option.

Column-$I$	Column-$II$
$(A)$ Moss	$(p)$ Possesses well-developed vascular tissues
$(B)$ Selaginella	$(q)$ Produces heterosporous spores
$(C)$ Usnea	$(r)$ Vegetative reproduction by adventitious branches
$(D)$ Equisetum	$(s)$ Asexual reproduction by motile or non-motile spores
$(E)$ Penicillium	$(t)$ Sexual reproduction by fruiting bodies
	$(u)$ Produces homosporous spores

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

Which groups depend on an external source of free water for fertilization?