From the given statements, identify the incorrect one.

Key is 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 a lead and is generally analytical in nature.

Same taxonomic keys are required for all taxonomic categories such as family, genus and species for identification purposes.