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Chapter 4: Introduction to Classification of Living Things
Study the first subtopic below. Unlock artificial vs natural classification, five kingdoms, ranks, binomial nomenclature and questions in the app.
Key Terms and Definitions
- Classification
- The process of grouping organisms according to their similarities and differences.
- Taxonomy
- The field of biology that deals with classifying organisms.
- Taxon (plural: taxa)
- Each unit or rank used in the classification of living things, e.g. kingdom, phylum, species.
- Species
- A group of closely related organisms that can interbreed under natural conditions and produce fertile offspring.
- Binomial nomenclature
- A scientific system of naming organisms using a two-part Latin name: the genus and the specific epithet.
- Artificial classification
- A classification system that groups organisms according to a few easily observable features.
- Natural classification
- A classification system that groups organisms based on many features in common, especially evolutionary relationships.
The Concept of Classification (Free full subtopic)
- The process of grouping organisms according to their similarities and differences is called classification.
- Organisms that are similar are placed in the same group. These similarities can be in terms of their evolutionary relationship or the way they carry out life processes such as feeding and reproduction.
- The field of biology that deals with classifying organisms is called taxonomy.
- Examples of organisms studied in classification include snails, orange trees, crocodiles, birds, lions, and baobab trees.
Spotlight
Scientists estimate that there could be as many as 8.7 million species of living things on Earth, yet fewer than 2 million have actually been named and described so far! Classification gives biologists a shared system to keep discovering, naming, and organising the millions of species still unknown to science.
Why classification matters (preview)
- There are millions of species — grouping them makes study and identification easier.
- It makes communication among biologists worldwide easier through standard names and groups.
- It enables scientists to predict characteristics of an organism based on the group it belongs to.
- It helps us understand evolutionary relationships.
Continue this chapter in the app
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What you unlock next:
- Artificial vs Natural classification (advantages & disadvantages)
- Major groups – the five kingdoms (Monera, Protoctista, Fungi, Plantae, Animalia)
- Seven ranks of classification (Kingdom → Species)
- Binomial nomenclature rules + scientific names of common organisms
- Chapter summary + 10 MCQs + 10 short answers with solutions
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