When writing scientific names by hand,what is drawn under each word?

Which of the following is the correct sequence in taxonomic classification?

Which of the following is not a broad category in the taxonomic hierarchy?

The common taxonomic categories are given below. Arrange them in the correct sequence starting from the smallest unit:
$(i)$ Genus $(ii)$ Family $(iii)$ Species $(iv)$ Order $(v)$ Subspecies

$A$ group of organisms that are very similar to each other and can freely interbreed in nature constitutes a .......

What is a $Taxon$?