Which branch of science deals with the identification and relationships of organisms?

Reproduction is possible between two members of which taxonomic category?

The International Code of Botanical Nomenclature $(ICBN)$ has provided a code for the classification of plants. Provide the hierarchy of units of classification that botanists follow while classifying plants and mention the different 'suffixes' used for these units.

Which of the following organisms is not correctly matched with its taxonomic category?

What is a $Taxon$?

Which of the following statements is incorrect?