What is the main difference between flowering and non-flowering plants?

Which one of the following is monoecious?

Match the items in Column $I$ with those in Column $II$:

Column $I$	Column $II$
$(A)$ Peritrichous flagellation	$(J)$ $Ginkgo$
$(B)$ Living fossil	$(K)$ $Macrocystis$
$(C)$ Rhizophore	$(L)$ $Escherichia \text{ } coli$
$(D)$ Smallest flowering plant	$(N)$ $Wolffia$
$(E)$ Largest perennial alga	$(M)$ $Selaginella$

Select the correct answer from the following:

In which of the following groups do the male and female gametophytes have independent,free-living existence?

Which of the following pairs of plants does not show seed formation?

Provide the missing terms for the following analogy-type questions:
$(i)$ Angiosperms : Flower :: Conifers : ...
(ii) Moss : Protonema :: Fern : ...