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classification key

Primary Information
Secondary Information

Definition

A classification key is a tool used to identify organisms by asking a series of questions about their characteristics. The questions are arranged in a branching format so that each answer leads to another question. Eventually, the user will reach a question that identifies the organism.

Classification keys are based on the concept of taxonomy, which is the science of classifying organisms.

Taxonomy uses a hierarchy of categories to classify organisms, starting with the most general category and ending with the most specific category. For example, the classification key for a dog might start with the question "Does the organism have fur?" If the answer is yes, then the user would follow the path that leads to the question "Does the organism have four legs?" If the answer is yes, then the user would follow the path that leads to the conclusion that the organism is a dog.

How can the word be used?

Classification keys are a valuable tool for scientists and students who need to identify organisms.

classification key

Different forms of the word

Noun:

Singular: classification key.

Plural: classification keys.

Adjective:

Classification-key: relating to a classification key.

Etymology

The word "classification key" comes from the Latin words "classis", meaning "rank" or "division", and "key", meaning "a device for opening something". It was first used in English in the 18th century to refer to a system for classifying organisms.

Question

Why are classification keys useful?

AQA Science Exam Question and Answer

Question:

What is a classification key, and how does it aid in identifying and categorizing organisms?

Answer:

A classification key is a tool used in biology to identify and categorise organisms based on their observable characteristics. It consists of a series of questions with a set of choices that lead to the identification of the organism's species or group. By following the specific path of questions and answers in the key, scientists and enthusiasts can determine the unique features of the organism and classify it into the appropriate taxonomic group. Classification keys are invaluable in the field of taxonomy, helping to organise and categorise the immense diversity of living organisms on Earth.