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A student of taxonomy was puzzled when ...

A student of taxonomy was puzzled when told by his professor to look for a key to identify a plant. He went to his went to his friend to clarify what 'key' the professor was referring to? What would the friend explain to him?

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Word Key. means here the taxonomic key. Taxonomic key is a device of diagnostic alternate characters which provide an easy method for identification of unknowm organisms. The taxonomic keys help in identification, nomenclature and classification of newly discovered plant or animal.
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