Explain why the binomial system is used to name living organisms rather than using common names.
Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).
Model answer (4 marks)
Common names differ between languages, countries and regions, so they can be confusing.
The binomial system gives each organism a unique two‑part name.
It is universal and used by scientists worldwide.
This avoids confusion – the same organism never gets two names and different organisms never share one name.
The binomial system gives each organism a unique two‑part name.
It is universal and used by scientists worldwide.
This avoids confusion – the same organism never gets two names and different organisms never share one name.
Examiner tips
- Use the word ‘unique’ to show understanding of binomial names. Mention that it is universal to gain full marks. Keep the answer concise – 4 points only.
Common mistakes
- Using only one point about common names. Forgetting to mention the two‑part (genus + species) structure. Mixing up ‘binomial’ with ‘polynomial’ or other terms.
Mark scheme (4 marks)
- Common names vary between languages / countries / regions
- The binomial system is universal / used by scientists worldwide
- Each organism is given a unique two-part name consisting of genus and species
- This avoids confusion / prevents the same organism being given different names or different organisms sharing the same name
Key terms in this question
Related
- Revision notes: Classification of living organisms →
- How to answer a "Explain" question →
- Decode the mark scheme abbreviations →
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