Use the taxonomic hierarchy
Order the Eukarya hierarchy from kingdom to species and interpret nested groups.
A Level; Cambridge International Biology 9700, 2028–2030. Written responses are self-checked; this does not certify supervised fieldwork or practical competence.
Before you begin
- Classification compares shared characteristics; populations occupy environments and contain variation.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which is more specific: family or genus?
What you will learn
- State the hierarchy kingdom, phylum, class, order, family, genus and species
- Explain what a shared lower-level group indicates
Build the explanation
Within Eukarya, the hierarchy is kingdom → phylum → class → order → family → genus → species. Each lower taxonomic group is nested within the one above it. Organisms sharing a genus are placed together in more levels of the hierarchy than organisms sharing only a kingdom, so their classification is more specific.
Use evidence within scope
The hierarchy is a classification system, not a guarantee that every named pair shares the same recent ancestry. Use the stated level precisely; genus and species together form a binomial name.
Pause and explain
Why does sharing a genus represent a more specific classification than sharing a kingdom?
Worked example
Arrange “family”, “genus” and “species” from broadest to most specific.
Show the worked solution
- The full sequence places family before genus.
- Species is the most specific named level.
Answer Family → genus → species.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Write the seven Eukarya levels in order from broadest to most specific.
Give me a hint
Identify the required evidence and sequence the reasoning.
Compare my reasoning
- Start with kingdom.
- End with species.
Kingdom → phylum → class → order → family → genus → species.
Look for these in your work
- Relevant evidence selected
- Reasoning linked to conclusion
Two organisms share a family but have different genera. What can be concluded?
Give me a hint
Use the supplied example or data to justify a conclusion.
Compare my reasoning
- They share the stated broader classification.
- They are not classified in the same genus.
They are both in the same family but not the same genus; the information alone does not show they are the same species.
Look for these in your work
- Concept applied
- Limit or assumption stated
Why does sharing a genus represent a more specific classification than sharing a kingdom?
Give me a hint
Apply the concept in a new context and qualify its limits.
Compare my reasoning
- A genus is nested within family, order, class, phylum and kingdom.
- It includes fewer organisms in the hierarchy.
A genus is a lower nested group, so sharing it means the organisms also share several broader levels, whereas a kingdom includes many more groups.
Look for these in your work
- New context handled
- Conclusion appropriately bounded
Common mistakes
- Reversing the hierarchy
- Saying two species in one genus are the same species
What can you explain now?
Which is more specific: family or genus?
Compare with the explanation
Genus
Genus is a lower, more specific level in the hierarchy.
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Make it stick
What is the full Eukarya hierarchy from kingdom to species?
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.