What is meant by Identification and nomenclature ? How is a key helpful in the identification & classification of an organism ?

Explanation

Identification is defined as, "Whether a collected organism is entirely new or already known. Nomenclature is defined as "providing a scientific name to an identified organism". Key is a taxonomical aid used for identification of plants and animals based on the similarities and dissimilarities. The keys are based on the contrasting characters generally in a pair called couplet. It represents the choice made between two opposite options. Each statement in the key is called lead, suparate taxonomic keys are required for each taxonomic category such as family, genus and species for Identification purposes. Keys are generally analytical in nature. Flora, Manuals, Monographs and catelogues are also help in correct Identification of plants of a given area.