Ficus elastica (Indian rubber plant) belongs to which family?

Most primitive and advanced families of dicots are respectively:

Leguminous plants belong to which family?

Which of the following characters are related to the family $Malvaceae$?
$(a)$ Five stamens
$(b)$ Marginal placentation
$(c)$ Infinite stamens
$(d)$ Twisted aestivation

Which one is not a character of a pea flower?

The division of $Leguminosae$ into its subfamilies is based upon,or the $Leguminosae$ is distinguished on the basis of: