Rice,cereals,monocots and plants represent

The scientific name of mango is $Mangifera\, indica\, Linn$. In this name,$Linn$ indicates:

In the scientific name of an organism,what does the first name represent?

Arrange the following taxonomic categories in ascending order.
$(a)$ Genus
$(b)$ Class
$(c)$ Order
$(d)$ Phylum
$(e)$ Family
$(f)$ Kingdom
$(g)$ Species
Choose the correct answer from the options given below:

In the given diagram,what do the labeled parts $P$ and $Q$ represent respectively?

Kingdom

$\uparrow$

$P$

$\uparrow$

Class

$\uparrow$

Order

$\uparrow$

$Q$

How many of the following statements are correct?
$(A)$ Each taxonomic category is a unit of classification.
$(B)$ Taxonomic groups are distinct biological entities.
$(C)$ Genera are aggregates of closely related families.
$(D)$ Both vegetative and reproductive characters are used to characterise the families.