Explain how the Linnaean system classifies living organisms.

AQA GCSE Biology (8461) — 4.6.4 Classification of living organisms · Explain · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Model answer (4 marks)

Organisms are grouped according to shared characteristics and structure.
The system uses seven hierarchical levels: kingdom, phylum, class, order, family, genus and species.
As you move down the hierarchy, each level contains smaller, more specific groups.
Members of the same group share more characteristics and are more closely related.

Examiner tips

Use the exact terms (kingdom, phylum, etc.)
Show the hierarchy from broad to specific
Explain that similarity increases down the ranks
Keep answer concise and to the point

Common mistakes

Using the wrong order of taxa
Confusing ‘taxa’ with ‘species’
Omitting the fact that similarity increases down the hierarchy

Mark scheme (4 marks)

Organisms are placed into groups based on their characteristics / structure
The system uses seven levels / taxa: kingdom, phylum, class, order, family, genus and species
Organisms are placed into smaller and more specific groups as you move down the hierarchy
Organisms in the same group share more characteristics with each other / are more closely related

Key terms in this question

Linnaean system