Which is the highest taxonomic category that includes all other groups of organisms?

$A$ branch of botany concerned with the classification,nomenclature,and identification of plants is $:-$

Which of the following statements is correct regarding a species?

Characteristics which delimit a family are more general than those which delimit a

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

Select the correct statements $(i-iv)$ regarding taxonomic categories.
$(i)$ Each step or rank in hierarchy is called taxonomic category.
$(ii)$ Species is a group of individual organisms with fundamental similarities capable of breeding among themselves.
$(iii)$ Taxonomic studies of all unknown organisms have led to the development of common categories like kingdom,phylum or division,class,order,family,genus and species.
$(iv)$ Lower the category,greater is the difficulty of determining the relationship to other taxa at the same level.