In the classification of the housefly,what is 'Insecta'?

Nicotiana is

Assertion $-A$: The term 'genus' is a single term.
Reason $-R$: $A$ genus may have one or more species; a species may be a single or a combined term.

Match the taxonomic categories given in column $I$ with their feature given in column $II$.

Column $I$	Column $II$
$A$. Taxon	$I$. Basic unit of classification
$B$. Species	$II$. $A$ taxonomic group of any rank
$C$. Phylum	$III$. Division is the same category in case of plants.
$D$. Genus	$IV$. Category identified based on the aggregates of characters
$E$. Order	$V$. Group of related species

As we go from Kingdom to Species, the number of common characteristics $ \dots $ and the number of species $ \dots $.

In plant classification,the order generally ends with . . . . . . .